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WAEC Mathematics Past Questions & Answers - Page 45

221.

Evaluate: 228350+72  

A.

47212

B.

47112

C.

4792

D.

47+2

Correct answer is C

228350+22

47152+62

6792

222.

If 6, P, and 14 are consecutive terms in an Arithmetic Progression (AP), find the value of P.

A.

9

B.

10

C.

6

D.

8

Correct answer is B

6, p, 14

14 - p = p - 6 

14 + 6 = p - 6

14 + 6 = p + p

2p2

= 202 

p = 10

223.

If 23y = 1111two, find the value of y

A.

4

B.

5

C.

6

D.

7

Correct answer is C

23y = 1111two,

2 x y1 + 3 x y0 = 1 x 23 + 1 x 21 + 1 x 2o 

2y + 3 = 8 + 4 + 2 + 1 

2y + 3 = 15 

2y2

122 

y = 6

224.

Evaluate; log39log28log39 

A.

-13

B.

12

C.

13

D.

-12

Correct answer is D

log39log28log39 

log332log223log332 

= 232

= 12 

225.

If T = {prime numbers} and M = {odd numbers} are subsets of μ  = {x : 0 < x ≤ 10} and x is an integer, find (T n M). 

A.

{4, 6, 8, 10}

B.

{1. 4, 6, 8, 10}

C.

{1, 2, 4, 6, 8, 10}

D.

{1, 2, 3, 5, 7, 8, 9}

Correct answer is A

T = {2, 3, 5, 7}

M = {1, 3, 5, 7, 9}

μ = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} 

T = = {1, 4, 6, 8, 9, 10} 

M = {2, 4, 6, 8, 10} 

(T M) = {4, 6, 8, 10}