WAEC SSCE - General Mathematics - 2009…

Pregunta 1 Informe

The angles of triangle are (x + 10)^o, (2x - 40)^o and (3x - 90)^o. Which of the following accurately describes the triangle?

it is a scalene triangle

it is right angled isosceles triangle

t is an equilateral triangle Respuesta correcta

It is an isosceles triangle but not right angled

Detalles de la respuesta

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Pregunta 2 Informe

If M and N are two fixed points in a plane. Find the locus L = [P : PM = PN]

a line equal to MN

line parallel to MN

Perpendicular bisector of MN Respuesta correcta

A circle centre P, radius MN

Detalles de la respuesta

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Loci

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Pregunta 3 Informe

The following is the graph of a quadratic friction, find the value of x when y = 0

1, 2

1, 4 Respuesta correcta

2, 3

1, 6

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Quadratic Equations

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Pregunta 4 Informe

Find the value to which N3000.00 will amount in 5 years at 6% per annum simple interest

N3,900.00 Respuesta correcta

N3,750.00

N3,600.00

N3,300

Detalles de la respuesta

Simple interest is calculated as the product of the principal, the rate of interest, and the time duration. From the question, we have a principal of N3000.00, an interest rate of 6%, and a duration of 5 years. Using the formula for simple interest, we can find the interest accrued over the 5 years as: Interest = (P * R * T) / 100 = (3000 * 6 * 5) / 100 = N900.00 The total value to which N3000.00 will amount to after 5 years is the sum of the principal and the interest, which is: Total = Principal + Interest = 3000 + 900 = N3900.00 Therefore, N3000.00 will amount to N3900.00 after 5 years at 6% per annum simple interest. So the correct answer is option A, N3,900.00.

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Modular Arithmetic

Ratio, Proportions And Rates

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Pregunta 5 Informe

Find the value of x in the diagram

50^o

60^o

70^o Respuesta correcta

80^o

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Pregunta 6 Informe

Find the quadratic equation whose roots are -$\frac{1}{2}$ and 3

2x² - 2x + 3 = 0

2x² - 2x - 3 = 0

2x² - 5x - 3 = 0 Respuesta correcta

3x² - 5x - 3 = 0

Detalles de la respuesta

To find the quadratic equation given its roots, we use the fact that for a quadratic equation of the form ax² + bx + c = 0, the roots are given by the formula: x = (-b ± √(b² - 4ac)) / 2a If the roots are given as α and β, then the quadratic equation can be written as: (x - α)(x - β) = 0 Expanding the above equation gives: x² - (α + β)x + αβ = 0 Therefore, to find the quadratic equation whose roots are -$\frac{1}{2}$ and 3, we substitute α = -$\frac{1}{2}$ and β = 3 into the equation: x² - (α + β)x + αβ = 0 x² - (-$\frac{1}{2}$ + 3)x + (-$\frac{1}{2}$ × 3) = 0 Simplifying the above equation, we get: 2x² - 5x - 3 = 0 Therefore, the quadratic equation whose roots are -$\frac{1}{2}$ and 3 is 2x² - 5x - 3 = 0. The correct option is (C) 2x² - 5x - 3 = 0.

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Pregunta 7 Informe

Simplify (x - 3y)² - (x + 3y)²

2(x + 3y)

(2x - 3y)

-12xy Respuesta correcta

6xy

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Algebraic Expressions

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Pregunta 8 Informe

The diameter of a bicycle wheel is 42cm. If the wheel makes 16 complete revolution, what will be the total distance covered by the wheel? [Take $\pi \frac{22}{7}$

672cm

1056cm

2112cm Respuesta correcta

4224cm

Detalles de la respuesta

The distance covered by the wheel is equal to the circumference of the wheel multiplied by the number of revolutions made. The circumference of the wheel can be calculated using the formula: circumference = diameter x pi circumference = 42cm x 22/7 circumference = 132cm Therefore, the distance covered by the wheel in 16 complete revolutions is: distance = circumference x number of revolutions distance = 132cm x 16 distance = 2112cm So, the answer is (c) 2112cm.

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Pregunta 9 Informe

From the diagram which of the following statements are correct? i. XQ is a radius of a circle centre Q. ii. /XQ/ = /QY/. iii. /QX/ = /XY/

i only

inand ii only Respuesta correcta

ii and iii only

i, ii and iii

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Circles

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Pregunta 10 Informe

A box contains black, white and red identical balls. The probability of picking a black ball at random from the box is $\frac{3}{10}$ and the probability of picking a white ball at random is $\frac{2}{5}$. If there are 30 balls in the box, how many of them are red?

9 Respuesta correcta

Detalles de la respuesta

The probability of picking a black ball at random from the box is $\frac{3}{10}$ and the probability of picking a white ball at random is $\frac{2}{5}$. Let's assume that there are x red balls in the box. Since there are a total of 30 balls, we can write: number of black balls + number of white balls + number of red balls = total number of balls $\frac{3}{10}(30) + \frac{2}{5}(30) + x = 30$ Simplifying the above equation gives: 9 + 12 + x = 30 x = 30 - 9 - 12 x = 9 Therefore, there are 9 red balls in the box.

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Pregunta 11 Informe

solve $\frac{2x + 1}{6} - \frac{3x - 1}{4}$ = 0

1 Respuesta correcta

$\frac{1}{5}$

-$\frac{1}{5}$

-1

Detalles de la respuesta

To solve the equation $\frac{2x + 1}{6} - \frac{3x - 1}{4} = 0$, we need to simplify the left-hand side and solve for x. First, we need to find a common denominator for the two fractions. The smallest common multiple of 6 and 4 is 12, so we can rewrite the equation as: \[\frac{2x+1}{6}\cdot \frac{2}{2} - \frac{3x-1}{4}\cdot \frac{3}{3} = 0\] Simplifying, we get: \[\frac{4x+2}{12} - \frac{9x-3}{12} = 0\] Combining the fractions, we get: \[\frac{4x+2-(9x-3)}{12} = 0\] Simplifying further, we get: \[\frac{-5x+5}{12} = 0\] Multiplying both sides by 12, we get: \[-5x+5=0\] Adding 5 to both sides, we get: \[-5x=-5\] Dividing both sides by -5, we get: \[x=1\] Therefore, the solution to the equation is x = 1.

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Pregunta 12 Informe

The interior angles of a pentagon are (2^x + 5)^o, (x + 20)^o, x^o, (3x - 20)^o and (x + 15)^o. Find the value of x

80^o

70^o

65^o Respuesta correcta

40^o

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Solution Of Linear Equations

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Pregunta 13 Informe

Simplify; $\frac{1}{2}\sqrt{32} - \sqrt{18} \sqrt{2}$

zero Respuesta correcta

$\sqrt{2}$

2$\sqrt{2}$

4\(\sqrt{2}\0

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Positive And Negative Integers, Rational Numbers

Surds (radicals)

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Pregunta 14 Informe

Find the value of x in the diagram

50^o

30^o

22^o

17^o Respuesta correcta

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Pregunta 15 Informe

Simplify: (3$\frac{1}{2} + 4\frac{1}{3}) \div (\frac{5}{6} - \frac{2}{3}$)

1$\frac{1}{4}$

8$\frac{1}{2}$

47 Respuesta correcta

Detalles de la respuesta

We will start by simplifying the expression inside the parenthesis first. 3$\frac{1}{2}$ + 4$\frac{1}{3}$ = (7/2) + (13/3) To add these two fractions, we need a common denominator. Multiplying the denominators together gives us 6, so: (7/2) + (13/3) = (21/6) + (26/6) = 47/6 Now, let's simplify the expression in the denominator: $\frac{5}{6} - \frac{2}{3}$ = $\frac{5}{6} - \frac{4}{6}$ = $\frac{1}{6}$ Finally, we can substitute these values into the original expression: (3$\frac{1}{2}$ + 4$\frac{1}{3}$) ÷ ($\frac{5}{6}$ - $\frac{2}{3}$) = (47/6) ÷ (1/6) When dividing fractions, we can multiply the first fraction by the reciprocal of the second: (47/6) ÷ (1/6) = (47/6) x (6/1) = 47 Therefore, the answer is 47.

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Number Bases

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Pregunta 16 Informe

In the diagram, \SQ\ = 4cm, \PT\ = 7cm. /TR/ = 5cm and ST//OR. If /SP/ = xcm, find the value of x

5.6 Respuesta correcta

6.5

6.6

6.8

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Pregunta 17 Informe

Express the square root of 0.000144 in the standard form

1.2 x 10^-4

1.2 x 10^-3

1.2 x 10^-2 Respuesta correcta

1.2 x 10^-1

Detalles de la respuesta

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Pregunta 18 Informe

An arc of a circle subtends an angle of 60^o at the centre. If the radius of the circle is 3cm, find , in terms of $\pi$, the length of the arc

$\pi$cm Respuesta correcta

2$\pi$cm

3$\pi$cm

6$\pi$cm

Detalles de la respuesta

When an angle in degrees is subtended at the center of a circle, the length of the arc it cuts out is given by: $$\text{Length of arc} = \frac{\text{angle}}{360^\circ} \times 2\pi r$$ where r is the radius of the circle. In this case, the angle is 60° and the radius is 3 cm. Substituting these values into the formula above, we get: $$\text{Length of arc} = \frac{60}{360^\circ} \times 2\pi (3\text{ cm}) = \frac{1}{6} \times 6\pi = \pi \text{ cm}$$ Therefore, the length of the arc, in terms of π, is π cm. Hence, the correct option is: $\pi$cm.

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Pregunta 19 Informe

The following is the graph of a quadratic friction, find the co-ordinates of point P

(0, 4) Respuesta correcta

(4, 0)

(0, -4)

(-4, 0)

Detalles de la respuesta

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Quadratic Equations

Graphs Of Linear And Quadratic Functions

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Pregunta 20 Informe

in the diagram, angle 20^o is subtended at the centre of the circle, find the value of x

30^o

50^o Respuesta correcta

80^o

100^o

Detalles de la respuesta

In the given diagram, we have a circle with center O and angle 20^o subtended at the center. We need to find the value of x. Firstly, we know that the angle subtended at the center of a circle is twice the angle subtended at the circumference by the same arc. Therefore, angle AOB = 2 × 20^o = 40^o Also, we know that angle in a semicircle is a right angle. So, angle AOC = 90^o. Using the fact that the angles in a triangle add up to 180^o, we can find angle BOC as follows: angle BOC = 180^o - angle AOB - angle AOC = 180^o - 40^o - 90^o = 50^o Since angle BOC is an angle at the circumference that subtends the arc BC, which is equal to x degrees, we have: x = angle BOC = 50^o Therefore, the value of x is 50^o. Answer is correct.

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Pregunta 21 Informe

If $\frac{3}{2x} - \frac{2}{3x} = 4$, solve for x

$\frac{4}{5}$

$\frac{4}{13}$

$\frac{5}{24}$ Respuesta correcta

$\frac{13}{24}$

Detalles de la respuesta

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Algebraic Fractions

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Pregunta 22 Informe

If a positive integer, list the values of x which satisfy the equation 3x - 4 < 6 and x - 1 > 0

{1, 2, 3}

{2, 3} Respuesta correcta

{2, 3, 4}

{2, 3, 4, 5}

Detalles de la respuesta

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Pregunta 23 Informe

In a particular year, the exchange rate of naira (N) varies directly with the Dollars{$}. If N1122 is equivalent to $8, find the Naira equivalent of $36

N8976

N5049 Respuesta correcta

N140.25

N31.17

Detalles de la respuesta

The exchange rate of naira (N) varies directly with the Dollars($). This means that the exchange rate is constant, and we can set up a proportion to solve the problem. If N1122 is equivalent to $8, we can write: N1122/$8 = x/$36 where x is the Naira equivalent of $36. To solve for x, we can cross-multiply and simplify: N1122 x 36 = $8 x x 40392 = 8x x = 40392/8 = 5049 Therefore, the Naira equivalent of $36 is N5049. So, the correct option is (B) N5049.

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Pregunta 24 Informe

Arrange the following numbers in descending orders of magnitude: 22_three, 34_five, 21_six

21_six, 22_three, 34_five,

21_six, 34_five, 22_three

22_three, 34_five, 21_six

34_five, 21_six, 22_three Respuesta correcta

Detalles de la respuesta

To compare these numbers, we need to convert all of them to the same base. Let's convert them all to base 10 for simplicity: - 22_three = 2\*3¹ + 2\*3⁰ = 6 + 2 = 8 - 34_five = 3\*5¹ + 4\*5⁰ = 15 + 4 = 19 - 21_six = 2\*6¹ + 1\*6⁰ = 12 + 1 = 13 So, in base 10, the numbers are 8, 19, and 13. To arrange them in descending order of magnitude, we simply sort them from largest to smallest: - 19, 13, 8 Therefore, the correct answer is: 34_five, 21_six, 22_three

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Pregunta 25 Informe

Using the diagram, find the bearing of X from Y

300^o

240^o Respuesta correcta

120^o

60^o

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Pregunta 26 Informe

A bucket holds 10 litres of water. How many buckets of water will fill a reservoir of size 8m x 7m x 5m.(1 litre = 1000cm³)`

280

2800

28000 Respuesta correcta

Detalles de la respuesta

The volume of the reservoir can be found by multiplying its dimensions: 8m x 7m x 5m = 280 m^3 Since 1 liter is equal to 1000 cubic centimeters (cm^3), 1 cubic meter is equal to 1,000,000 cubic centimeters. Therefore, the reservoir has a volume of: 280 m^3 x 1,000,000 cm^3/m^3 = 280,000,000 cm^3 Each bucket can hold 10 liters of water or 10,000 cubic centimeters (cm^3) of water since 1 liter is equal to 1000 cm^3. Therefore, the number of buckets needed to fill the reservoir is: 280,000,000 cm^3 ÷ 10,000 cm^3/bucket = 28,000 buckets Therefore, the answer is 28,000.

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Logical Reasoning

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Pregunta 27 Informe

In the diagram, /TP/ = 12cm and it is 6cm from O, the centre of the circle, Calculate < TOP

120^o

90^o Respuesta correcta

60^o

45^o

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Pregunta 28 Informe

PQRS is a trapezium. QR//PS, /PQ/ = 5cm, /OR/ = 6cm, /PS/ = 10cm and angle QPS = 42^o. Calculate, correct to the nearest cm², the area of the trapezium (h = 3.35cm² )

27cm² Respuesta correcta

30cm²

36cm²

37cm²

Detalles de la respuesta

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Pregunta 29 Informe

The capacity of a water tank is 1,800 litres. If the tank is in form of a cuboid with base 600cm by 150 cm. Find the height of the tank

2cm

20cm Respuesta correcta

200cm

2000cm

Detalles de la respuesta

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Pregunta 30 Informe

If log 2 = x, log 3 = y and log 7 = z, find, in terms of x, y and z, the value of log ($\frac{28}{3}$)

2x + y - z

2x + z - y Respuesta correcta

x + y - 2x

x + x - y

Detalles de la respuesta

We can use logarithmic rules to solve this question. Let's first express log($\frac{28}{3}$) in terms of x, y, and z. log($\frac{28}{3}$) = log(28) - log(3) We know that: log(28) = log(4 × 7) = log(4) + log(7) = 2x + z log(3) = y Therefore: log($\frac{28}{3}$) = 2x + z - y So the correct answer is 2x + z - y.

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Pregunta 31 Informe

Two sets are disjoint if

they are both empty

their union is an empty set

their intersection is an empty set Respuesta correcta

one of them is a subset of the other

Detalles de la respuesta

Two sets are said to be disjoint if their intersection is an empty set. In other words, if there are no common elements between the sets, they are said to be disjoint. For example, the sets {1,2,3} and {4,5,6} are disjoint since their intersection is an empty set {} or ∅. On the other hand, the sets {1,2,3} and {2,3,4} are not disjoint since they have elements in common, namely 2 and 3.

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Sets

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Pregunta 32 Informe

If (2x + 3)³ = 125, find the value of x

1 Respuesta correcta

Detalles de la respuesta

We are given that (2x + 3)³ = 125. We can rewrite 125 as 5³. Therefore, we have: (2x + 3)³ = 5³ Taking the cube root of both sides, we get: 2x + 3 = 5 Solving for x, we get: 2x = 2 x = 1 Therefore, the value of x is 1. Answer: (a) 1.

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Pregunta 33 Informe

If 9^2x = $\frac{1}{3}$(27^x), find x

-1 Respuesta correcta

-2

Detalles de la respuesta

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Solution Of Linear Equations

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Pregunta 34 Informe

What is the median of the following scores: 22 35 41 63 74 82

52 Respuesta correcta

Detalles de la respuesta

To find the median of a set of numbers, we first need to arrange them in ascending or descending order. In this case, arranging the numbers in ascending order gives us: 22, 35, 41, 63, 74, 82 The median is the middle number in the set when the numbers are arranged in order. Since we have an even number of numbers in this set, there are two middle numbers: 41 and 63. To find the median, we take the average of these two numbers: Median = (41 + 63) / 2 = 104 / 2 = 52 Therefore, the median of the scores is 52.

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Pregunta 35 Informe

PQRS is a trapezuim. QR//PS, /PQ/ = 5cm, /OR/ = 6cm, /PS/ = 10cm and angle QPS = 42^o. Calculate the perpendicular distance between the parallel sides

3.35cm Respuesta correcta

3.73cm

4.50cm

4.62cm

Detalles de la respuesta

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Algebraic Expressions

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Pregunta 36 Informe

The pie chart shows the distribution of 4320 students who graduated from four departments in a university. If a student is picked at random from the four departments, what id the probability that he is not from the education department?

$\frac{3}{10}$

$\frac{2}{9}$

$\frac{5}{18}$

$\frac{7}{10}$ Respuesta correcta

Detalles de la respuesta

To find the probability that a student picked at random is not from the education department, we need to find the total number of students who are not from the education department and divide it by the total number of students in all departments. From the pie chart, we can see that the education department has 30% of the total students. Therefore, the remaining three departments have a total of 70% of the total students. To find the probability of picking a student who is not from the education department, we divide the percentage of students who are not in the education department by 100%: Probability = $\frac{70}{100}$ = $\frac{7}{10}$ Therefore, the probability that a student picked at random is not from the education department is $\frac{7}{10}$. The correct option is: $\frac{7}{10}$.

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Pregunta 37 Informe

If c and k are the roots of 6 - x - x² = 0, find c + k

-1 Respuesta correcta

-3

Detalles de la respuesta

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Pregunta 38 Informe

If /XY/ = 50m, how far cast of X is Y?

25.5m

40.6m

40.8m

43.3m Respuesta correcta

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Pregunta 39 Informe

Given that sin 60^o = $\frac{\sqrt{3}}{2}$ and cos 60^o = $\frac{1}{2}$, evaluate $\frac{1 - sin 60^o}{1 + cos 60^o}$

$\frac{2 + \sqrt{3}}{3}$

$\frac{1 - \sqrt{3}}{3}$

$\frac{1 + \sqrt{3}}{3}$

$\frac{2 - \sqrt{3}}{3}$ Respuesta correcta

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Sine, Cosine And Tangent Of An Angle

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Pregunta 40 Informe

Factorize x² - 2x - 3xy completely

(x - 2)(3x - y)

(x - 3y)(x - 2) Respuesta correcta

(x - 3y)(x - 3y)

(3x + y)(x - 2)

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Algebraic Expressions

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Pregunta 41 Informe

In an examination, Kofi scored x% in Physics, 50% in Chemistry and 70% in Biology. If his mean score for the three subjects was 55%, find x

45 Respuesta correcta

Detalles de la respuesta

Kofi's mean score for the three subjects was 55%, so the total percentage score for the three subjects is 3 x 55 = 165%. Let's assume that Kofi scored x% in Physics. Then, the total percentage score for Physics, Chemistry and Biology would be: x + 50 + 70 = 165 Simplifying the equation, we get: x = 165 - 50 - 70 x = 45 Therefore, Kofi scored 45% in Physics. So the correct option is (B) 45.

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Pregunta 42 Informe

Each of the interior angles of a regular polygon is 140^o. Calculate the sum of all the interior angles of the polygon

1080^o

1260^o Respuesta correcta

1800^o

2160^o

Detalles de la respuesta

In a regular polygon with n sides, each interior angle measures: \begin{align*} 180^\circ - \frac{360^\circ}{n} \end{align*} Since each interior angle of this polygon is 140^o, we can equate the above formula to 140^o: \begin{align*} 180^\circ - \frac{360^\circ}{n} &= 140^\circ\\ \frac{360^\circ}{n} &= 40^\circ\\ n &= \frac{360^\circ}{40^\circ}\\ n &= 9 \end{align*} Therefore, the given polygon is a nonagon (a polygon with nine sides). The sum of the interior angles of a polygon with n sides can be calculated using the formula: \begin{align*} S &= (n-2)180^\circ \end{align*} Substituting n=9 into this formula, we get: \begin{align*} S &= (9-2)180^\circ\\ &= 7\cdot180^\circ\\ &= 1260^\circ \end{align*} Therefore, the sum of all the interior angles of the given polygon is 1260^o. Hence, the correct option is: - 1260^o

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Indices

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Pregunta 43 Informe

If 85% of x is N3230, what is the value of x?

N2745.50

N3714.50

N3800.00 Respuesta correcta

N4845.00

Detalles de la respuesta

We can solve this problem using a proportion. If 85% of x is N3230, that means we can write: 0.85x = N3230 To solve for x, we need to isolate x on one side of the equation. We can do this by dividing both sides by 0.85: x = N3230 ÷ 0.85 Using a calculator, we get: x ≈ N3800.00 Therefore, the value of x is N3800.00.

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Percentages

Positive And Negative Integers, Rational Numbers

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Pregunta 44 Informe

Express 2.7864 x 10^-3 to 2 significant figures

0.28

0.27

0.0028 Respuesta correcta

0.0027

Detalles de la respuesta

To express 2.7864 x 10^-3 to 2 significant figures, we need to round off the number to the second significant digit from the left. Since the first significant digit is 2, and the second significant digit is 7, we will look at the third digit, which is 8. Since 8 is greater than or equal to 5, we round up the second significant digit (7) by 1. Therefore, the number becomes 0.0028. So, the answer is 0.0028.

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Positive And Negative Integers, Rational Numbers

Number Bases

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Pregunta 45 Informe

In the diagram, IG is parallel to JE, JEF = 120^o and FHG = 130^o, fins the angle marked t

40^o

70^o Respuesta correcta

80^o

100^o

Detalles de la respuesta

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Pregunta 46 Informe

The pie chart shows the distribution of 4320 students who graduated from four departments in a university. How many students graduated from the science department?

840

864 Respuesta correcta

920

960

Detalles de la respuesta

To find the number of students who graduated from the science department, we need to look at the pie chart and determine the percentage of students that belong to that department. From the pie chart, we can see that the science department occupies 20% of the entire circle. To find the number of students in the science department, we need to calculate 20% of 4320, which can be done by multiplying 4320 by 0.20. 20% of 4320 = 0.20 x 4320 = 864 Therefore, the number of students who graduated from the science department is 864. So, the correct answer is option B: 864.

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Mensuration

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WAEC SSCE - General Mathematics - 2009 (Objective)