WAEC SSCE - General Mathematics - 2014 (Objective)

Question 1 Report

If log 5.957 = 0.7750, find log $3 \sqrt{0.0005957}$

4.1986

2.9250 Correct answer

1.5917

1.2853

Answer Details

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Logarithms

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Question 2 Report

The graph given is for the relation y = 2x² + x - 1. Find the minimum value of y

0.00

-0.65

-1.25 Correct answer

-2.10

Answer Details

To find the minimum value of y for the given relation y = 2x^2 + x - 1, we need to locate the vertex of the parabolic graph. The vertex of a parabola with equation y = ax^2 + bx + c is given by the coordinates (-b/2a, c - b^2/4a). In this case, a = 2, b = 1, and c = -1. Substituting these values into the formula, we get: Vertex x-coordinate = -b/2a = -1/(2*2) = -1/4 Vertex y-coordinate = 2(-1/4)^2 + (1/4) - 1 = -1.25 Therefore, the minimum value of y is -1.25. So the correct option is (C) -1.25.

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Simple Operations On Algebraic Expressions

Quadratic Equations

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Question 3 Report

Simplify $\frac{\sqrt{8^2 \times 4^{n + 1}}}{2^{2n} \times 16}$

4 Correct answer

Answer Details

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Positive And Negative Integers, Rational Numbers

Surds (radicals)

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Question 4 Report

Make u the subject of formula, E = $\frac{m}{2g}$(v² - u²)

u = $\sqrt{v^2 - \frac{2Eg}{m}}$ Correct answer

u = $\sqrt{\frac{v^2}{m} - \frac{2Eg}{4}}$

u = $\sqrt{v- \frac{2Eg}{m}}$

u = $\sqrt{\frac{2v^2Eg}{m}}$

Answer Details

The formula we want to solve for u is E = (m/2g)(v^2 - u^2).

To make u the subject of the formula, we need to isolate u on one side of the equation by performing the necessary algebraic operations.

First, we'll simplify the right side of the equation:

E = (m/2g)(v^2 - u^2)
2gE/m = v^2 - u^2    // Multiply both sides by 2g/m

Next, we'll isolate u^2 by adding it to both sides of the equation:

2gE/m + u^2 = v^2

Finally, we'll solve for u by taking the square root of both sides of the equation:

u = sqrt(v^2 - 2gE/m)

Therefore, the value of u as the subject of the formula is:

u = sqrt(v^2 - 2gE/m)

Option A is the correct answer.

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Change Of Subject Of A Formula/Relation

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Question 5 Report

In parallelogram PQRS, QR is produced to M such that |QR| = |RM|. What fraction of the area of PQMS is the area of PRMS?

$\frac{1}{4}$

$\frac{1}{3}$

$\frac{2}{3}$ Correct answer

$\frac{3}{4}$

Answer Details

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Indices

Triangles And Polygons

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Question 6 Report

In the figures, PQ is a tangent to the circle at R and UT is parallel to PQ. if < TRQ = x^o, find < URT in terms of x

2x^o

(90 - x)^o

(90 + x)^o

(180 - 2x)^o Correct answer

Answer Details

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Circles

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Question 7 Report

If x = {0, 2, 4, 6}, y = {1, 2, 3, 4} and z = {1, 3} are subsets of u = {x:0 $\geq$ x $\geq$ 6}, find x $\cap$ (Y' $\cup$ Z)

{0, 2, 6}

{1, 3}

{0, 6) Correct answer

{9}

Answer Details

To solve this problem, we need to follow the given operations in order of precedence, i.e., first we have to find the complement of y, then union it with z and finally find the intersection of x with the resulting set. The complement of y (denoted by Y') is the set of all elements in u that are not in y. So, Y' = {0, 5, 6}. The union of Y' and Z (denoted by Y' $\cup$ Z) is the set of all elements that are in Y' or Z or both. So, Y' $\cup$ Z = {0, 1, 3, 5, 6}. Finally, the intersection of x with Y' $\cup$ Z (denoted by x $\cap$ (Y' $\cup$ Z)) is the set of all elements that are in both x and Y' $\cup$ Z. So, x $\cap$ (Y' $\cup$ Z) = {0, 6}. Therefore, the answer is {0, 6}.

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Sets

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Question 8 Report

$\begin{array}{c|c}height & 2 & 3 & 4 & 5 & 6 \\ \hline frequency & 2 & 4 & 5 & 3 & 1
\end{array}$
The table shows the distribution of the height of plants in a nursery. Calculate the mean height of the plants.

3.8 Correct answer

3.0

2.8

2.3

Answer Details

To calculate the mean height of the plants, we need to first find the sum of all the heights and divide it by the total number of plants. We can do this using the formula: mean = (sum of all heights) / (total number of plants) To find the sum of all the heights, we need to multiply each height by its corresponding frequency and add up the results. So, the sum of all heights = (2 x 2) + (3 x 4) + (4 x 5) + (5 x 3) + (6 x 1) = 4 + 12 + 20 + 15 + 6 = 57 The total number of plants is the sum of all the frequencies: 2 + 4 + 5 + 3 + 1 = 15. Therefore, the mean height of the plants = 57 / 15 = 3.8. Hence, the answer is 3.8.

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Representation Of Data

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Question 9 Report

In a cumulative frequency graph, the lower quartile is 18 years while the 60th percentile is 48 years. What percentage of the distribution is at most 18 years or greater than 48 years?

15%

35%

65% Correct answer

85%

Answer Details

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Representation Of Data

Surds (radicals)

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Question 10 Report

If (x - a) is a factor pf bx - ax + x², find the other factor.

(x + b) Correct answer

(x - b)

(a + b)

(a - b)

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Algebraic Expressions

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Question 11 Report

The coordinates of points P and Q are (4, 3) and (2, -1) respectively. Find the shortest distance between P and Q.

10$sqrt{2}$

4$sqrt{5}$

5$sqrt{2}$

2$sqrt{5}$ Correct answer

Answer Details

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Circles

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Question 12 Report

If a number is selected at random from each of the sets p = {1, 2, 3} and Q = {2, 3, 5}, find the probability that the sum of the numbers is prime

$\frac{5}{9}$

1$\frac{4}{9}$

$\frac{1}{3}$ Correct answer

$\frac{2}{9}$

Answer Details

To find the probability that the sum of the numbers is prime, we need to first determine all the possible sums of numbers from sets P and Q. The elements in set P are {1, 2, 3}, and the elements in set Q are {2, 3, 5}. To find all the possible sums, we can create a table of sums by adding each element of set P to each element of set Q: | | 2 | 3 | 5 | |---|---|---|---| | 1 | 3 | 4 | 6 | | 2 | 4 | 5 | 7 | | 3 | 5 | 6 | 8 | From this table, we see that there are nine possible sums. To determine which of these sums are prime, we can simply check each one: - 3: Not prime - 4: Not prime - 5: Prime - 6: Not prime - 7: Prime - 8: Not prime - 9: Not prime - 10: Not prime - 11: Prime So, there are three possible sums that are prime: 5, 7, and 11. Therefore, the probability that the sum of the numbers is prime is: $$\frac{\text{number of favorable outcomes}}{\text{total number of possible outcomes}} = \frac{3}{9} = \frac{1}{3}$$ Therefore, the answer is option (C) $\frac{1}{3}$.

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Question 13 Report

Find the truth set of the equation x² = 3(2x + 9)

{x : x = 3, x = 9}

{x : x = -3, x = -9}

{x : x = 3, x = -9}

{x : x = -3, x = 9} Correct answer

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Quadratic Equations

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Question 14 Report

In what modulus is it true that 9 + 8 = 5?

mod 10

mod 11

mod 12 Correct answer

mod 13

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Modular Arithmetic

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Question 15 Report

Given that cos x = $\frac{12}{13}$, evaluate $\frac{1 - \tan x}{\tan x}$

$\frac{5}{13}$

$\frac{5}{7}$

$\frac{7}{5}$ Correct answer

$\frac{13}{5}$

Answer Details

We can use trigonometric identities to evaluate the expression. We know that: - $\tan x = \frac{\sin x}{\cos x}$. - $\sin^2x + \cos^2x = 1$. We can use the second identity to find $\sin x$: $$\begin{aligned} \sin^2x + \cos^2x &= 1 \\ \sin^2x &= 1 - \cos^2x \\ \sin x &= \sqrt{1 - \cos^2x} \\ &= \sqrt{1 - \left(\frac{12}{13}\right)^2} \\ &= \frac{5}{13} \end{aligned}$$ Now we can substitute $\sin x$ and $\cos x$ into the expression we need to evaluate: $$\begin{aligned} \frac{1 - \tan x}{\tan x} &= \frac{1 - \frac{\sin x}{\cos x}}{\frac{\sin x}{\cos x}} \\ &= \frac{\cos x - \sin x}{\sin x} \\ &= \frac{\frac{12}{13} - \frac{5}{13}}{\frac{5}{13}} \\ &= \frac{7}{5} \end{aligned}$$ Therefore, the answer is $\frac{7}{5}$.

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Introductory Calculus

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Question 16 Report

Which of the following is a measure of dispersion?

range Correct answer

percentile

median

quartile

Answer Details

A measure of dispersion describes how spread out or varied a set of data is. Among the options given, only the range is a measure of dispersion. Range is calculated by subtracting the minimum value from the maximum value in a dataset. It provides information about the spread of the data from the lowest to the highest value. Percentile, median, and quartile are measures of central tendency, which describe the typical or central value in a dataset.

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Measures Of Dispersion

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Question 17 Report

In the diagram, the value of x + y = 220^o. Find the value of n

20^o

40^o Correct answer

60^o

80^o

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Indices

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Question 18 Report

A chord subtends an angle of 120^o at the centre of a circle of radius 3.5cm. Find the perimeter of the minor sector containing the chord, [Take $\pi = \frac{22}{7}$]

14$\frac{1}{3}$cm Correct answer

12$\frac{5}{6}$cm

8$\frac{1}{7}$cm

7$\frac{1}{3}$cm

Answer Details

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Question 19 Report

A chord, 7cm long, is drawn in a circle with radius 3.7cm. Calculate the distance of the chord from the centre of the circle

0.7cm

1.2cm Correct answer

2.0cm

2.5cm

Answer Details

To find the distance of the chord from the center of the circle, we can use the formula: distance from center = √(r^2 - (c/2)^2) where r is the radius of the circle and c is the length of the chord. In this case, r = 3.7 cm and c = 7 cm. Therefore: distance from center = √(3.7^2 - (7/2)^2) = √(13.69 - 12.25) = √1.44 = 1.2 cm Therefore, the distance of the chord from the center of the circle is 1.2 cm. The logic behind the formula is that the distance from the center of the circle to the chord is the perpendicular distance from the center to the line that contains the chord. If we draw radii from the center of the circle to the endpoints of the chord, we can form a right triangle with the chord as the hypotenuse. The distance from the center to the chord is the height of this triangle, which can be found using the Pythagorean theorem.

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Circles

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Question 20 Report

The volume of a cube is 512cm³. Find the length of its side

6cm

7cm

8cm Correct answer

9cm

Answer Details

To find the length of a side of a cube, we need to take the cube root of its volume. Given that the volume of the cube is 512cm³, we have: side³ = volume side³ = 512cm³ Taking the cube root of both sides, we get: side = ∛(512cm³) side = 8cm Therefore, the length of the side of the cube is 8cm. Answer: Option (C) 8cm

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Volumes

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Question 21 Report

In the diagram, ST is parallel to UW, < WVT = x^o, < VUT = y^o, < RSV = 45^o and < VTU = 20^o. Calculate the value of y

25 Correct answer

Answer Details

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Question 22 Report

F x varies inversely as y and y varies directly as Z, what is the relationship between x and z?

x $\alpha$ z

x $\alpha \frac{1}{z}$ Correct answer

x $\alpha z^2$

x \(\alpha \frac{1}{z^2}\0

Answer Details

The statement "F x varies inversely as y" can be mathematically written as x = k/y, where k is the constant of proportionality. Similarly, "y varies directly as Z" can be written as y = kz, where k is again the constant of proportionality. Substituting y in the first equation, we get x = k/(kz), which simplifies to x = 1/z. Therefore, we can conclude that x varies inversely with z, which is mathematically represented as x $\alpha$ 1/z. So, the correct answer is: x $\alpha \frac{1}{z}$.

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Logical Reasoning

Fractions, Decimals And Approximations

Variation

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Question 23 Report

If $\frac{2}{x - 3} - \frac{3}{x - 2}$ is equal to $\frac{p}{(x - 3)(x - 2)}$, find p

-x - 5

-(x + 3)

5x - 13

5 - x Correct answer

Answer Details

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Algebraic Fractions

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Question 24 Report

Three quarters of a number added to two and a half of the number gives 13. Find the number

4 Correct answer

Answer Details

Let's assume the number we are looking for to be 'x'. According to the problem statement, three quarters of the number can be written as $\frac{3}{4}x$ and two and a half of the number can be written as $2.5x$. It is given that the sum of these two quantities gives 13. So we can write it as: $\frac{3}{4}x + 2.5x = 13$ Now, we can simplify this equation by combining the two terms on the left-hand side: $\frac{3}{4}x + 2.5x = 13$ $\Rightarrow \frac{3}{4}x + \frac{10}{4}x = 13$ $\Rightarrow \frac{13}{4}x = 13$ $\Rightarrow x = \frac{13 \times 4}{13}$ $\Rightarrow x = 4$ Therefore, the number we are looking for is 4. Hence, the answer is 4.

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Solution Of Linear Equations

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Question 25 Report

Subtract $\frac{1}{2}$(a - b - c) from the sum of $\frac{1}{2}$(a - b + c) and $\frac{1}{2}$
(a + b - c)

$\frac{1}{2}$ (a + b + c) Correct answer

$\frac{1}{2}$ (a - b - c)

$\frac{1}{2}$ (a - b + c)

$\frac{1}{2}$ (a + b - c)

Answer Details

We have: \begin{align*} &\frac{1}{2}(a-b+c)+\frac{1}{2}(a+b-c)-\frac{1}{2}(a-b-c)\\ &=\frac{1}{2}(2a)\\ &=a \end{align*} Therefore, the expression simplifies to $a$. So, the answer is: $\frac{1}{2}(a+b+c)$.

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Algebraic Fractions

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Question 26 Report

In the diagram, O is the centre of the circle of the circle, PR is a tangent to the circle at Q < SOQ = 86^o. Calculate the value of < SQR.

43^o Correct answer

47^o

54^o

86^o

Answer Details

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Circles

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Question 27 Report

The radii of the base of two cylindrical tins, P and Q are r and 2r respectively. If the water level in p is 10cm high, would be the height of the same quantity of water in Q?

2.5cm Correct answer

5.0cm

7.5cm

20.0cm

Answer Details

The volume of a cylinder is given by the formula V = πr²h, where r is the radius of the base of the cylinder and h is the height of the cylinder. The volume of the water in tin P is V_P = πr²h_P, where r is the radius of the base of tin P and h_P is the height of the water in tin P. The volume of the same quantity of water in tin Q is V_Q = π(2r)²h_Q = 4πr²h_Q, where 2r is the radius of the base of tin Q and h_Q is the height of the water in tin Q. Since the same quantity of water is in both tins, V_P = V_Q. Substituting the expression for V_P and V_Q into the equation V_P = V_Q gives πr²h_P = 4πr²h_Q, which simplifies to h_Q = h_P/4. Therefore, the height of the water in tin Q is one-fourth of the height of the water in tin P. Since the height of the water in tin P is 10cm, the height of the water in tin Q would be (10/4) cm = 2.5 cm. Therefore, the height of the same quantity of water in tin Q is 2.5 cm. Answer option (A) is the correct answer.

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Question 28 Report

A box contains 13 currency notes, all of which are either N50 or N20 notes. The total value of the currency notes is N530. How many N50 notes are in the box?

9 Correct answer

Answer Details

Let's assume that there are x N50 notes and y N20 notes in the box. From the problem, we know that the total number of currency notes is 13, so we have: x + y = 13 ----(1) We also know that the total value of the currency notes is N530. If we express this in terms of the number of N50 and N20 notes, we get: 50x + 20y = 530 ----(2) We now have two equations (1) and (2) with two variables (x and y), which we can solve simultaneously. Multiplying equation (1) by 20, we get: 20x + 20y = 260 Subtracting this equation from equation (2), we get: 30x = 270 Dividing both sides by 30, we get: x = 9 Therefore, there are 9 N50 notes in the box. Answer: 9

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Number Bases

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Question 29 Report

The bar chart shows the scores of some students in a test. If one students is selected at random, find the probability that he/she scored at most 2 marks

$\frac{11}{18}$

$\frac{11}{20}$ Correct answer

$\frac{7}{22}$

$\frac{5}{19}$

Answer Details

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Probability

Statistics

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Question 30 Report

Determine the value of m in the diagram

80^o

90^o Correct answer

110^o

150^o

Answer Details

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Angles And Intercepts On Parallel Lines

Angles

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Question 31 Report

In the diagram, PQR is straight line, ( m + n) = 120o and ( n + r) = 100o. Find (m + r).

110^o

120^o

140^o Correct answer

160^o

Answer Details

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Question 32 Report

Find the number of term in the Arithmetic Progression(A.P) 2, -9, -20,...-141.

14 Correct answer

Answer Details

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Sequence And Series

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Question 33 Report

The area of a sector a circle with diameter 12cm is 66cm². If the sector is folded to form a cone, calculate the radius of the base of the cone [Take $\pi = \frac{22}{7}$]

3.0cm

3.5cm Correct answer

7.0cm

7.5cm

Answer Details

The area of a sector of a circle is given by the formula: A = (θ/360)πr^2 where A is the area of the sector, θ is the angle of the sector in degrees, r is the radius of the circle. Let's first find the radius of the circle. The diameter of the circle is given as 12 cm. Therefore, the radius is half of the diameter, i.e., r = 12/2 = 6 cm. The area of the sector is given as 66 cm^2. Therefore, 66 = (θ/360)π(6^2) 66 = (θ/360)π(36) 66 = (θ/10)π θ = (660/π) × 10/360 θ = 18.86° (approx.) Now, we can use the radius of the circle and the angle of the sector to find the slant height (l) of the cone: l = √(r^2 + h^2), where h is the height of the cone. The lateral area of the cone (i.e., the curved surface area) is half the area of the sector: L = (1/2)A = (1/2) × 66 = 33 cm^2 The slant height of the cone is given by: l = L/r = 33/6 = 5.5 cm We can use the Pythagorean theorem to find the height of the cone: h = √(l^2 - r^2) = √(5.5^2 - 6^2) = √(30.25 - 36) = √5.75 Therefore, the height of the cone is h = 2.4 cm (approx.). Finally, we can use the formula for the volume of a cone to find the radius of the base: V = (1/3)πr^2h We know the volume of the cone is equal to the area of the sector: V = A = (θ/360)πr^2 = (18.86/360) × π × r^2 Therefore, (1/3)πr^2h = (18.86/360) × π × r^2 h = (18.86/360) × 3 r^2 = (3/π) × (360/18.86) × 66 r = √((3/π) × (360/18.86) × 66) = 3.5 cm (approx.) Hence, the radius of the base of the cone is 3.5 cm. Therefore, the correct option is (b) 3.5cm.

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Change Of Subject Of A Formula/Relation

Representation Of Data

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Question 34 Report

Simplify: $\sqrt{12} ( \sqrt{48} - \sqrt{3}$)

18 Correct answer

Answer Details

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Question 35 Report

If 23_x = 32₅, find the value of x

7 Correct answer

Answer Details

To find the value of x, we need to determine what base value the number 23_x represents. We are told that 23_x is equal to 32₅. In other words, the value represented by 23_x is equal to the value represented by 32₅. We can convert 32₅ to base 10 to get: 32₅ = (3 x 5¹) + (2 x 5⁰) = 15 + 2 = 17 So, we have: 23_x = 17 To find the value of x, we need to determine what base value raised to what power is equal to 17. We can do this by trying different values of x. If x is 2, then 23₂ = (2 x 2¹) + (3 x 2⁰) = 4 + 3 = 7 If x is 3, then 23₃ = (2 x 3¹) + (3 x 3⁰) = 6 + 3 = 9 If x is 4, then 23₄ = (2 x 4¹) + (3 x 4⁰) = 8 + 3 = 11 If x is 5, then 23₅ = (2 x 5¹) + (3 x 5⁰) = 10 + 3 = 13 If x is 6, then 23₆ = (2 x 6¹) + (3 x 6⁰) = 12 + 3 = 15 If x is 7, then 23₇ = (2 x 7¹) + (3 x 7⁰) = 14 + 3 = 17 So, we have found that if x is 7, then 23_x = 17, which matches the value of 32₅. Therefore, the value of x is 7. Answer: 7

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Number Bases

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Question 36 Report

Given that x > y and 3 < y, which of the following is/are true? i. y > 3 ii. x < 3 iii. x > y > 3

i and ii

i and iii Correct answer

i, ii and iii

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Inequalities

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Question 37 Report

If x : y = 3 : 2 and y : z = 5 : 4, find the value of x in the ratio x : y : z

15 Correct answer

Answer Details

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Question 38 Report

In the diagram, PQR is a straight line, (m + n) = 120^o and (n + r) = 100^o. Find (m + r)

110^o

120^o

140^o Correct answer

160^o

Answer Details

Let's start by using the fact that PQR is a straight line, which means that m + n + r = 180°. We can then use the given information to form two equations and solve for m + r. From (m + n) = 120°, we can substitute n = 120° - m to get: (m + 120° - m + r) = 180° r + 120° = 180° r = 60° From (n + r) = 100°, we can substitute n = 120° - m and r = 60° to get: (120° - m + 60°) = 100° m = 80° Finally, we can find m + r by adding m and r: m + r = 80° + 60° = 140° Therefore, the answer is 140°.

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Number Bases

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Angles And Intercepts On Parallel Lines

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Question 39 Report

The bar chart shows the scores of some students in a test. How many students took the test?

20 Correct answer

Answer Details

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Representation Of Data

Loci

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Question 40 Report

The probability of an event P happening is $\frac{1}{5}$ and that of event Q is $\frac{1}{4}$. If the events are independent, what is the probability that neither of them happens?

$\frac{4}{5}$

$\frac{3}{4}$

$\frac{3}{5}$ Correct answer

$\frac{1}{20}$

Answer Details

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Probability

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Question 41 Report

In the diagram, ST is parallel to UW, < WVT = x^o, < VUT = y^o, < RSV = 45^o and < VTU = 20^o. Find the value of x

45 Correct answer

135

Answer Details

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Question 42 Report

A man's eye level is 1.7m above the horizontal ground and 13m from a vertical pole. If the pole is 8.3m high, calculate, correct to the nearest degree, the angle of elevation of the top of the pole from his eyes.

33^o

32^o

27^o Correct answer

26^o

Answer Details

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Angles Of Elevation And Depression

Angles And Intercepts On Parallel Lines

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Question 43 Report

If one student is selected at random, find the probability that he/she scored at most 2 marks

$\frac{11}{18}$

$\frac{11}{20}$ Correct answer

$\frac{7}{22}$

$\frac{5}{19}$

Answer Details

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Question 44 Report

Simplify 10$\frac{2}{5} - 6 \frac{2}{3} + 3$

6$\frac{4}{15}$

6$\frac{11}{15}$ Correct answer

7$\frac{4}{15}$

7$\frac{11}{15}$

Answer Details

To simplify the expression 10$\frac{2}{5} - 6 \frac{2}{3} + 3$, we first need to convert the mixed numbers to improper fractions. 10$\frac{2}{5}$ can be written as $\frac{52}{5}$ and 6$\frac{2}{3}$ can be written as $\frac{20}{3}$. So, the expression becomes: \begin{align*} 10\frac{2}{5} - 6 \frac{2}{3} + 3 &= \frac{52}{5} - \frac{20}{3} + 3\\ &= \frac{156}{15} - \frac{100}{15} + \frac{45}{15}\\ &= \frac{101}{15} \end{align*} Therefore, the simplified expression is 6$\frac{11}{15}$. Hence, the correct option is: \boxed{2. 6\frac{11}{15}}

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Fractions, Decimals And Approximations

Algebraic Fractions

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Question 45 Report

Find the gradient of the line joining the points (2, -3) and 2, 5)

undefined Correct answer

Answer Details

To find the gradient of the line joining two points, we use the formula: Gradient = (change in y) / (change in x) We can calculate the change in y by subtracting the y-coordinate of one point from the y-coordinate of the other point, and similarly, we can calculate the change in x by subtracting the x-coordinate of one point from the x-coordinate of the other point. In this case, the two points are (2, -3) and (2, 5). The change in y is: 5 - (-3) = 8 The change in x is: 2 - 2 = 0 Since the change in x is 0, we cannot divide by it, and the gradient is undefined. This means that the line joining these two points is vertical and has no slope. Therefore, the correct answer is: undefined.

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Coordinate Geometry

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Question 46 Report

The graph given is for the relation y = 2x² + x - 1.What are the coordinates of the point S?

(1, 0.2)

(1, 0.4)

(1, 2.0) Correct answer

(1, 40)

Answer Details

To find the coordinates of point S on the graph, we need to use the equation of the graph, which is given as y = 2x^2 + x - 1. From the graph, we can see that the point S has x-coordinate of 1. To find the y-coordinate, we can substitute x=1 into the equation and solve for y: y = 2(1)^2 + (1) - 1 y = 2 + 1 - 1 y = 2 Therefore, the coordinates of point S are (1, 2). So, the answer is (c) (1, 2.0).

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Coordinate Geometry

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Question 47 Report

A ship sails x km due east to a point E and continues x km due north to F. Find the bearing the bearing of f from the starting point.

045^o Correct answer

090^o

135^o

225^o

Answer Details

Let's draw a diagram to visualize the situation:

        N
        |
        F
        |
W-------+-------E
        |
        |
        S

The ship starts at the point marked "W", then sails east to reach the point marked "E". The distance between W and E is x km. Then the ship sails north from E to reach the point marked "F". The distance between E and F is also x km.

We want to find the bearing of F from W. This is the angle that the line segment WF makes with the north-south line, measured in a clockwise direction.

Let's call the point where the north-south line intersects the line WE as point G. Then we have a right triangle WGE, where WG is the distance travelled east by the ship, and GE is the distance travelled north. The angle WGE is the bearing we're looking for.

From the right triangle WGE, we can use trigonometry to find the angle WGE:

tan(WGE) = opposite / adjacent = GE / WG = x / x = 1

Taking the arctan of both sides, we get:

WGE = arctan(1) = 45 degrees

Therefore, the bearing of F from W is 045 degrees. Answer: (a) 045^o.

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Bearings

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Question 48 Report

Each exterior angle of a polygon is 30^o. Calculate the sum of the interior angles

540^o

720^o

1080^o

1800^o Correct answer

Answer Details

The sum of the exterior angles of a polygon is always 360 degrees. Therefore, if each exterior angle is 30 degrees, the polygon must have 360/30 = 12 sides. The formula to find the sum of interior angles of a polygon is (n-2) x 180 degrees, where n is the number of sides. Substituting n = 12 into the formula, we get: (12-2) x 180 = 10 x 180 = 1800 degrees Therefore, the sum of the interior angles of this polygon is 1800 degrees. So the correct option is 1800^o.

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Circles

Indices

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Question 49 Report

approximate 0.0033780 to 3 significant figures

338

0.338

0.00338 Correct answer

0.003

Answer Details

To approximate 0.0033780 to 3 significant figures, we need to count the first three non-zero digits, then round off the remaining digits. The first three non-zero digits are 3, 3, and 7, so we keep them. The next digit is 8, which is greater than or equal to 5, so we round up the last digit (0) to 1. Therefore, the answer is 0.00338 (option c).

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Fractions, Decimals And Approximations

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