Mathematics Past Questions And Answers
The distance(s) in metres covered by a particle in motion at any time, t seconds, is given by S =120t - 16t\(^2\). Find in metres, the distance covered by the body before coming to rest.
- A. 220
- B. 222
- C. 223
- D. 225
The expression ax2 + bx + c equals 5 at x = 1. If its derivative is 2x + 1, what are the values of a, b, c respectively?
- A. 1, 3, 1
- B. 1, 2, 1
- C. 2, 1, 1
- D. 1, 1, 3
A library received $1,300 grant. It spends 10% of the grant on magazine subscriptions, 35% on new books, 15% to repair damaged books, 30% to buy new furniture and 10% to train library staff.
(a) Represent this information on a pie chart.
(b) Calculate, correct to the nearest whole number, the percentage increase of the amount for buying books over that of new furniture.
View Discussion (0)WAEC 2011 THEORY.jpg)
The table shows the distribution of the number of hours per day spent in studying by 50 students.
Number of hours per day | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
Number of students | 5 | 7 | 5 | 9 | 12 | 4 | 3 | 5 |
Calculate, correct to two decimal places,
the: (a) mean; (b) standard deviation.
View Discussion (0)WAEC 2021 THEORYA square tile has side 30 cm. How many of these tiles will cover a rectangular floor of length 7.2m and width 4.2m?
- A. 720
- B. 336
- C. 420
- D. 576
Find the matrix A
A \(\begin {bmatrix} 0 & 1\\2 & -1 \end {bmatrix}\) = \(\begin {bmatrix} 2 & -1\\1 & 0 \end {bmatrix}\)
- A. \(\begin {bmatrix} 2 & 1\\-^1/_2 & -^1/_2 \end {bmatrix}\)
- B. \(\begin {bmatrix} 0 & 1\\^1/_2 & ^1/_2 \end {bmatrix}\)
- C. \(\begin {bmatrix} 2 & 1\\0 & -1 \end {bmatrix}\)
- D. \(\begin {bmatrix} 2 & 1\\^1/_2 & -2 \end {bmatrix}\)
In the diagram, PQRS is a rhombus and ∠ PSQ = 35°. Calculate the size of ∠ PRO
- A. 65°
- B. 55°
- C. 45°
- D. 35°
If the gradient of the curve y = 2kx2 + x + 1 at x = 1 is 9, find k.
- A. 4
- B. 3
- C. 2
- D. 1
If \(\begin{vmatrix} 1+2x & -1 \\ 6 & 3-x \end{vmatrix} = -3 \), find the values of x.
- A. \(x = 3, -2\)
- B. \(x = 4, \frac{-2}{3}\)
- C. \(x = -4, \frac{3}{2}\)
- D. \(x = 4, \frac{-3}{2}\)
The interior angles of a pentagon are (2x + 5)°, (x + 20)°, x°, (3x - 20)° and (x + 15)°. Find the value of x
- A. 80°
- B. 70°
- C. 65°
- D. 40°