Jamb Mathematics 2013 Past Questions and Answers

Question 21:

• JAMB 2013

If y = x sin x, find \(\frac{\delta y}{\delta x}\)

A. Sin x - cos x
B. Cos x - x sin x
C. Cos x + x sin x
D. Sin x + x cos x

Question 22:

• JAMB 2013

If y = (2x + 2)\(^3\), find \(\frac{\delta y}{\delta x}\)

A. 3(2x +2)²
B. 6(2x +2)
C. 3(2x +2)
D. 6(2x +2)²

Question 23:

• JAMB 2013

The radius of a circle is increasing at the rate of 0.02cms^-1. Find the rate at which the area is increasing when the radius of the circle is 7cm.

A. 0.75cm²S^-1
B. 0.53cm²S^-1
C. 0.35cm²S^-1
D. 0.88cm²S^-1

Question 24:

• JAMB 2013

Find the mean of t + 2, 2t - 4, 3t + 2 and 2t.

A. T + 1
B. 2t
C. 2t + 1
D. T

Question 25:

• JAMB 2013

The mean of seven numbers is 10. If six of the numbers are 2, 4, 8, 14, 16 and 18, find the mode.

A. 6
B. 8
C. 14
D. 2