Mathematics 1988 Jamb Past Questions and Answers

Question 11 :

• JAMB 1988

For what values of x is the curve y = \(\frac{x^2 + 3}{x + 4}\) decreasing?

A. -3 < x \(\leq\) 0
B. -3 \(\geq\) x < 0
C. 0 < x < 3
D. 0 \(\leq\) x \(\leq\) 3

Question 12 :

• JAMB 1988

The solutions of x2 - 2x - 1 = 0 are the points of intersection of two graphs. if one of the graphs is y = 2 + x - x2, find the second graph

A. Y = 1 - x
B. Y = 1 + x
C. Y = x - 1
D. Y = 3x + 3

Question 13 :

• JAMB 1988

If the sum of the 8th and 9th terms of an arithmetic progression is 72 and the 4th term is -6, find the common difference

A. 4
B. 8
C. 6\(\frac{2}{3}\)
D. 9\(\frac{1}{3}\)

Question 14 :

• JAMB 1988

If 7 and 189 are the first and fourth terms of geometric progression respectively, find the sum of the first three terms of the progression

A. 182
B. 91
C. 63
D. 28

Question 15 :

• JAMB 1988

Find correct to one decimal place, 0.24633 \(\div\) 0.0306

A. 0.8
B. 1.8
C. 8.0
D. 8.1