A carregar...
Pressione e Mantenha para Arrastar |
|||
Clique aqui para fechar |
Pergunta 1 Relatório
If x is jointly proportional to the cube of y and the fourth power of z. In what ratio is x increased or decreased when y is halved and z is doubled?
Detalhes da Resposta
Pergunta 2 Relatório
The scores of 16 students in a mathematics test are 65, 65, 55, 60, 60, 65, 60, 70, 75, 70, 65, 70, 60, 65, 65,
70. What is the sum of the median and modal scores?
Detalhes da Resposta
Pergunta 4 Relatório
If 0.0000152 x 0.042 = A x 108, where 1 ≤
A < 10, find A and B
Detalhes da Resposta
0.0000152 x 0.042 = A x 108
1 ≤
A < 10, it means values of A includes 1 - 9
0.0000152 = 1.52 x 10-5
0.00042 = 4.2 x 10-4
1.52 x 4.2 = 6.384
10-5 x 10-4
= 10-5-4
= 10-9
= 6.38 x 10-9
A = 6.38, B = -9
Pergunta 5 Relatório
Factorize completely 81a4 - 16b4
Detalhes da Resposta
81a4 - 16b4 = (9a2)2 - (4b2)2
= (9a2 + 4b2)(9a2 - 4b2)
N:B 9a2 + 4b2 = (3a - 2b)(3a - 2b)
Pergunta 6 Relatório
If x + 2 and x - 1 are factors of the expression 1x3 + 2kx2 + 24, find the values of 1 and K
Detalhes da Resposta
f(x) = Lx3 + 2kx2 + 24
f(-2) = -8L + 8k = -24
4L - 4k = 12
f(1):L + 2k = -24
L - 4k = 3
3k = -27
k = -9
1 = -6
Pergunta 7 Relatório
PQRS is a desk of dimensions 2m ×
0.8 which is inclined at 30∘
to the horizontal. Find the inclination of the diagonal PR to the horizontal
Detalhes da Resposta
tanθ = 0.82 = (0.4)
θ = tan-1(0.4)
From the diagram, the inclination of the diagonal PR to the horizontal is 10∘ 42'
Pergunta 8 Relatório
y varies partly as the square of x and partly as the inverse of the square root of x. Write down the expression for y if y = 2 when x = 1 and y = 6 when x = 4.
Detalhes da Resposta
y = kx2 + c√x
y = 2 when x = 1
2 = k + c1
k + c = 2
y = 6 when x = 4
6 = 16k + c2
12 = 32k + c
k + c = 2
32k + c = 12
= 31k + 10
k = 1031
c = 2 - 1031
= 62−1031
= 5231
y = 10x231+5231√x
Pergunta 9 Relatório
Simplify log10 a13 + 14 log10 a - 112 log10a7
Detalhes da Resposta
log10 a13
+ 14
log10 a - 112
log10a7 = log10 a13
+ log1014
- log10 a712
= log10 a712
- log10 a712
= log10 1 = 0
Pergunta 10 Relatório
On a square paper of length 2.524375cm is inscribed square diagram of length 0.524375cm. Find the area of the paper not covered by the diagram. correct to 3 significant figures.
Detalhes da Resposta
Area of the paper = area of square = L x B or S2
where s = S x k
Area of the paper = (2.524)2
area of the diagram = (0.524)2
area not covered = (2.524)2 - (0.524)2
= 6.370576 - 0.274576
= 6.096
= 6.10cm2 (2 s.f)
Pergunta 11 Relatório
If M represents the median and D the mode of the measurements 5, 9, 3, 5, 7, 5, 8, then (M, D) is
Detalhes da Resposta
Pergunta 12 Relatório
The lengths of the sides of a right angled triangle are (3x + 1)cm, (3x - 1)cm and xcm. Find x
Detalhes da Resposta
(3x + 1)2 = (3x - 1)2 + 2 (Pythagoras's theorem)
9x2 + 6x + 1 = 9x - 6x2 + 1 + x2
x2 - 12x = 0
x(x - 12) = 0
x = 0 or 12
Pergunta 13 Relatório
Simplify 32x−1 + 2−xx−2
Detalhes da Resposta
32x−1
+ 2−xx−2
= 32x−1
- x−2x−2
= 32x−1
- 1
= 3−(2x−1)2x−1
= 3−2x+12x−1
= 4−2x2x−1
Pergunta 14 Relatório
PQRS is a cyclic quadrilateral. If ∠QPS = 75o, what is the size of ∠QRS?
Detalhes da Resposta
Pergunta 15 Relatório
In a triangle PQT, QR = √3cm , PR = 3cm, PQ = 2√3 cm and PQR = 30o. Find angles P and R
Detalhes da Resposta
By using cosine formula, p2 = Q2 + R2 - 2QR cos p
Cos P = Q2+R2−p22QR
= (3)2+2(√3)2−322√3
= 3+12−912
= 612
= 12
= 0.5
Cos P = 0.5
p = cos-1 0.5 = 60∘
= < P = 60∘
If < P = 60∘
and < Q = 30
< R = 180∘
- 90∘
angle P = 60∘
and angle R is 90∘
Pergunta 16 Relatório
If a rod of length 250cm is measured as 255cm long in error, what is the percentage error in the measurement?
Detalhes da Resposta
% error = Actual errorreal value
x 100
= 5250
x 100
= 2
Pergunta 17 Relatório
The letters of the word MATRICULATION are cut and put into a box. One letter is drawn at random from the box. Find the probability of drawing a vowel
Detalhes da Resposta
Vowels of letters are 6 in numbers
prob. of vowel = 613
Pergunta 18 Relatório
The figure FGHK is a rhombus. What is the value of angle X?
Detalhes da Resposta
< HKF = 60? , < KFG = 120?
< KFG = < KHG = x(opposite angles)
x = 120?
Pergunta 19 Relatório
Find the missing value in the following table:
x−2−10123y=x3−x+3333927
Detalhes da Resposta
When x = -2, y = x3 - x + 3
= -23 - (-2) + 3
= -8 + 2 + 3
= -3
Pergunta 20 Relatório
In a class of 60 pupils, the statistical distribution of the numbers of pupils offering Biology, History, French, Geography and Additional mathematics is as shown in the pie chart. How many pupils offer Additional Mathematics?
Detalhes da Resposta
2x - 24)∘ + (3x - 18)∘ + (2x + 12)∘ + (x + 12)∘ + x∘ = 360∘
9x = 360∘ + 18∘
x = 3789
= 42∘ , if x = 42∘ , then add maths = 2x−42360 x 60
= 2×42−24360 x 60
= 84−246
= 10
Pergunta 21 Relatório
If w varies inversely as V and U varies directly as w3, Find the relationship between u and v given that u = 1, when v = 2
Detalhes da Resposta
W α
1v
u α
w3
w = k1v
u = k2w3
u = k2(k1v
)3
= k2k21v3
k = k2k1k2
u = kv3
k = uv3
= (1)(2)3
= 8
u = 8v3
Pergunta 22 Relatório
Find x if (xbase4)2 = 100100base2
Detalhes da Resposta
(x2)4 to base10 gives (1 x 25) + (1 x 25) + (1 x 2)
32 + 4 = 36
x2 = 36, x = 6
610 to base 4 = 461r2
= 124
Pergunta 23 Relatório
In the figure, find PRQ
Detalhes da Resposta
Angle subtended at any part of the circumference of the circle 125o2 at centre = 360? - 235? = 125?
¯PQR = 1252
= 6212 ?
Pergunta 24 Relatório
The farm yield of four crops on a piece of land in Ondo are represented on the pie chart. what is the angle of the sector occupies by Okro in the chart?
Detalhes da Resposta
Adding the values of all the items together, it gives 70
Okro sector = 145270 x 360o1
= 19.33∘
= 1913 ∘
Pergunta 25 Relatório
A ship H leaves a port P and sails 30 km due south. Then it sails 50km due west. What is the bearing of H from P
Detalhes da Resposta
Pergunta 26 Relatório
If O is the centre of the circle in the figure, find the value of x
Detalhes da Resposta
From the diagram; The value of x = 360∘ - 2(130∘ )
= 360 - 260
= 100∘
Pergunta 27 Relatório
PQRS is a cyclic quadrilateral which PQ = PS. PT is a tangent to the circle and PQ makes an angle of 50?
with the tangent as shown in the figure. What is the size of QRS?
Detalhes da Resposta
< SPQ = 80?
< SPQ + < SRQ = 180(Supplementary)
80 + < QRS = 180? - 80?
= 100?
Pergunta 29 Relatório
One interior angle of a convex hexagon is 170o and each of the remaining interior angles is equal to xo. Find x
Detalhes da Resposta
An hexagon polygon is a six sided polygon
n = 6
sum of all interior angles of hexagon polygon will be (2n - 4) x 90o
= [2 x 6 - 4] x 90
= 720o
If one angle is 170o and each of the remaining five angles is 5xo
5xo + 170o = 720o
= 5x + 550
x = 5505
= 110o
Pergunta 30 Relatório
Given a regular hexagon, calculate each interior angle of the hexagon
Detalhes da Resposta
Sum of interior angles of polygon = (2n - 4)rt < s
sum of interior angles of an hexagon
(2 x 6 - 4) x 90o = (12 - 4) x 90o
= 8 x 90o
= 720o
each interior angle will have 720o6
= 120o
Pergunta 31 Relatório
PQR is the diagram of a semicircle RSP with centre at Q and radius of length 3.5cm. If QPT = 60o. Find the perimeter of the figure PTRS. π = 227
Detalhes da Resposta
Circumference of PRS = π2
= 227
x 71
x 12
= 11cm
Side PT = 7cm, Side TR = 7cm
Perimeter(PTRS) = 11cm + 7cm + 7cm
= 25cm
Pergunta 32 Relatório
In the figure PT is a tangent to the circle with centre at O. If PQT = 30?
, find the value of PTO
Detalhes da Resposta
FROM the diagram, PQT = 50∘
PTQ = 50∘ (opposite angles are supplementary)
Pergunta 33 Relatório
Find the mean of the following 24.57, 25.63, 24.32, 26.01, 25.77
Detalhes da Resposta
24.57+25.63+24.32+26.01+25.775
mean = 126.35
= 25.26
Pergunta 34 Relatório
Make T the subject of the equation av1?v = ?2v+Ta+2T
Detalhes da Resposta
av1?v
= ?2v+Ta+2T
(av)3(1?v)3
= 2v+Ta+2T
a3v3(13?v)3
= 2v+Ta+2T
= 2v(1?v)3?a4v32a3v3?(1?v)3
Pergunta 35 Relatório
Which of the following equations represents the graph above?
Detalhes da Resposta
x = -2 or x = 14
(x + 2)(4x - 1) = 0
y = 2 - 7x - 4x2
Pergunta 36 Relatório
Without using tables find the numerical value of log749 + log7(17 )
Detalhes da Resposta
log749 + log717
= log77
= 1
Pergunta 37 Relatório
The scores of set of final year students in the first semester examination in a paper are 41, 29, 55, 21, 47, 70, 70, 40, 43, 56, 73, 23, 50, 50. Find the median of the scores.
Detalhes da Resposta
By re-arranging 21, 23, 29, 40, 41, 43| 47, 50| 50, 55, 56, 70, 70, 73
The median = 47+502
972
= 4812
Pergunta 38 Relatório
Given that cos z = L , whrere z is an acute angle, find an expression for cot z - cosec zsec z + tan z
Detalhes da Resposta
Given Cos z = L, z is an acute angle
cot z - cosec zsec z + tan z
= cos z
= cos zsin z
cosec z = 1sin z
cot z - cosec z = cos zsin z
- 1sin z
cot z - cosec z = L−1sin z
sec z = 1cos z
tan z = sin zcos z
sec z = 1cos z
+ sin zcos z
= 1l
+ sin zL
the original eqn. becomes
cot z - cosec zsec z + tan z
= L−1sin z1+sinzL
= L(L−1)sin z(1+sin z)
= L(L−1)sin z+1−cos2z
= sin z + 1
= 1 + √1−L2
= L(L−1)1−L+1√1−L2
Pergunta 39 Relatório
Solve the following equations 4x - 3 = 3x + y = x - y = 3, 3x + y = 2y + 5x - 12
Detalhes da Resposta
4x - 3 = 3x + y = x - y = 3.......(i)
3x + y = 2y + 5x - 12.........(ii)
eqn(ii) + eqn(i)
3x = 15
x = 5
substitute for x in equation (i)
5 - y = 3
y = 2
Pergunta 40 Relatório
If (23 )m (34 )n = 252729 , find the values of m and n
Detalhes da Resposta
(23
)m (34
)n = 252729
2m4n
x 3n3m
= 283-6
2m - 2n x 3n - m = 28 x 3-6
m - 2n = 8........(i)
-m + n = -6........(ii)
Solving the equations simultaneously
m = 4, n = -2
Pergunta 41 Relatório
A man drove for 4 hours at a certain speed, he then doubled his speed and drove for another 3 hours. Although he covered 600 kilometers. At what speed did he drive for the last 3 hours?
Detalhes da Resposta
Speed = distancetime
let x represent the speed, d represent distance
x = d4
d = 4x
2x = 600−d3
6x = 600 - d
6x = 600 - 4x
10x = 600
x = 60010
= 60km/hr
Pergunta 42 Relatório
In a figure, PQR = 60o, PRS = 90o, RPS = 45o, QR = 8cm. Determine PS
Detalhes da Resposta
From the diagram, sin 60o = PR8
PR = 8 sin 60 = 8√32
= 4√3
Cos 45o = PRPS
= 4√3PS
PS Cos45o = 4√3
PS = 4√3
x 2
= 4√6
Pergunta 43 Relatório
Solve the simultaneous equations for x in x2 + y - 8 = 0, y + 5x - 2 = 0
Detalhes da Resposta
x2 + y - 8 = 0, y + 5x - 2 = 0
Rearranging, x2 + y = 8.....(i)
5x + y = 2.......(ii)
Subtract eqn(ii) from eqn(i)
x2 - 5x - 6 = 0
(x - 6)(x + 1) = 0
x = 6, -1
Pergunta 44 Relatório
Correct each of the numbers 59.81798 and 0.0746829 to three significant figures and multiply them, giving your answer to three significant figures
Detalhes da Resposta
59.81798 = 59.8 (3 s.f)
0.0746829 = 0.0747
59.8 x 0.0747 = 4.46706
= 4.48 (3s.f)
Pergunta 45 Relatório
A construction company is owned by two partners X and Y and it is agreed that their profit will be divided in the ratio 4:5. At the end of the year, Y received ₦5,000 more than X. What is the total profit of the company for the year?
Detalhes da Resposta
Total sharing ratio is 9
X has 4, Y has 4 + 1
If 1 is ₦5000
Total profit = 5000 x 9
= ₦45,000
Pergunta 46 Relatório
Find the angle of the sectors representing each item in pie chart of the following data 6, 10, 14, 16, 26
Detalhes da Resposta
6 + 10 + 14 + 16 + 26 = 72
672
x 360
= 30o
Similarly others give 30o, 50o, 70o, 80o and 130o respectively
Pergunta 47 Relatório
In a sample survey of a University Community, the following table shows the percentage distribution of the number of members per household:
No. of members per household12345678TotalNo. of households3121528211074100
What is the median?
Detalhes da Resposta
xf132133154285216107784
Median is half of total frequency = 50th term
4 falls in the range = 4
Pergunta 48 Relatório
In the figure, PQR is a straight line. Find the values of x and y.
Detalhes da Resposta
23 + 3y + 45∘ = 180∘
3x + 6y + 90∘ = 360∘
3x + 67 = 270.......(i) x 2, 5x + y + y = 180∘
5x + 2y = 180∘ .......(ii) x 6
6 x 12y = 540..........(iii)
30x + 12y = 1080.........(iv)
egn(iv) - eqn(iii)
24x = 540
x = 22.5 and y = 33.75∘
Gostaria de prosseguir com esta ação?