G varies directly as the square of H, If G is 4 when H is
MATHEMATICS
WAEC 2011
G varies directly as the square of H, If G is 4 when H is 3, find H when G = 100
- A. 15
- B. 25
- C. 75
- D. 225
Correct Answer: A. 15
Explanation
G \(\alpha\) H2
G = KH2
4 = K(3)2
4 = 9k; K = \(\frac{4}{9}\)
100 = \(\frac{4}{9}H^2\)
4H2 = 900
H2 = \(\frac{900}{4}\)
H2 = 225
H = \(\sqrt{225}\)
H = 15
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