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JAMB Mathematics Past Questions & Answers - Page 86

426.

Simplify 1 - ( $\frac{1}{7}$ x 3 $\frac{1}{2}$ ) $\div$ $\frac{3}{4}$

$\frac{1}{3}$

$\frac{2}{3}$

Correct answer is B

1 - ( $\frac{1}{7}$ x 3 $\frac{1}{2}$ ) $\div$ $\frac{3}{4}$

1 - ( $\frac{1}{7}$ x $\frac{7}{2}$ ) x $\frac{4}{3}$

1 - $\frac{1}{2}$ x $\frac{4}{3}$

1 - $\frac{2}{3}$ = $\frac{1}{3}$

427.

The nth term of the sequence 3, 9, 27, 81.....is

3 x 3^n-2

3 x 3^n-1

3 x 3ⁿ⁺²

3 x 3ⁿ⁺¹

View answer & explanation

Correct answer is B

3,9,27,81,.....
r = $\frac{9}{8}$ = 3
T_n = ar^n-1

T_n = 3(3)^n-1 = $\frac{3(3^2)}{3}$

428.

If y = 2x³ + 6x² + 6x + 1, Find $\frac{dy}{dx}$

6x² + 12x + 1

6x² + 6x + 1

6x² + 6x + 6

6x² + 12x + 6

View answer & explanation

Correct answer is D

y = 2x³ + 6x² + 6x + 1

$\frac{dy}{dx}$ = 6x² + 12x + 6

429.

Evaluate $\frac{12.02 \times 20.06}{26.04 \times 60.06}$ , correct to three significant figures.

0.157

0.154

0.155

0.158

View answer & explanation

Correct answer is B

$\frac{12.02 \times 20.06}{26.04 \times 60.06}$ = $\frac{241.1212}{15698.96}$ = 0.154

430.

The mean of 2-t, 4+t, 3-2t, 2+t and t-1 is

-t

-2

View answer & explanation

Correct answer is A

Mean = $\frac{2 - t + 4 + t + 3 - 2t + 2 + t + t - 1}{5}$

= $\frac{10}{5}$ = 2

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