Jamb Mathematics Past Questions and Answers

Question 446:

• JAMB 2013

Find the inverse \(\begin{pmatrix} 5 & 3 \\ 6 & 4 \end{pmatrix}\)

A. \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & -\frac{5}{2} \end{vmatrix}\)
B. \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
C. \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
D. \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)

Question 447:

• 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 448:

• 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 449:

• 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 450:

• JAMB 2013

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

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