Mathematics 2019 Jamb Past Questions and Answers

Question 21 :

• JAMB 2019

The marks scored by 30 students in a Mathematics test are recorded in the table below:

Scores(Mark)	0	1	2	3	4	5
Noofstudents	4	3	7	8	6	2

What is the total number of marks scored by the children?

A. 82
B. 15
C. 63
D. 75

Question 22 :

• JAMB 2019

If given two points A(3, 12) and B(5, 22) on a x-y plane. Find the equation of the straight line with intercept at 2.

A. Y = 5x + 2
B. Y = 5x + 3
C. Y = 12x + 2
D. Y = 22x + 3

Question 23 :

• JAMB 2019

If P(2, m) is the midpoint of the line joining Q(m, n) and R(n, -4), find the values of m and n.

A. M = 0, n = 4
B. M = 4, n = 0
C. M = 2, n = 2
D. M = -2, n = 4

Question 24 :

• JAMB 2019

If \(\begin{vmatrix} 2 & -4 \\ x & 9 \end{vmatrix} = 58\), find the value of x.

A. 10
B. 30
C. 14
D. 28

Question 25 :

• JAMB 2019

If \(y = 6x^3 + 2x^{-2} - x^{-3}\), find \(\frac{\mathrm d y}{\mathrm d x}\).

A. \(\frac{\mathrm d y}{\mathrm d x} = 15x^2 - 4x^{-2} - 3x^{-2}\)
B. \(\frac{\mathrm d y}{\mathrm d x} = 6x + 4x^{-1} - 3x^{-4}\)
C. \(\frac{\mathrm d y}{\mathrm d x} = 18x^2 - 4x^{-3} + 3x^{-4}\)
D. \(\frac{\mathrm d y}{\mathrm d x} = 12x^2 + 4x^{-1} - 3x^{-2}\)