1989 - WAEC Mathematics Past Questions and Answers - page 5

Reflex POR = 2PQR
Reflex PQR = 360^o - 114^o = 246^o
PQR = 246/2 = 123^o

Tan 69.7 = 40/h

x² + 2x + 1 = 25

x² + 6x - 4x -24= 0

x(x + 6) - 4(x + 6) = 0

(x - 4) - (x + 6) = 0

x = 4 or -6 = -6,4

log p = 2log x + 3log q

log p = logx ² + logq ³

logp = log x ²q ³

p = x ²q ³

Probability that 3 customers are attended to in the sequence they arrive 

= prob of attending to the 1st arrival x prob of attending to the second last x prob of attending to the last

= \(\frac{1}{3} \times \frac{1}{2} \times \frac{1}{1}\)

= \(\frac{1}{6}\)

80^o = 2 x 5x(angle at the center)

=80^o = 10x; x = 80^o/10

= 8^o

1st term a = 2; 6th term = a + (16-1)d = 2 + 5d
2 + (2 + 5d) = 161/2; 4 + 5d = 161/2
5d = 12.5 ∴ = 2.5
the 4th term is 2 + (4-1)2.5= 91/2