P varies inversely as the square of W. When W = 4, P = 9….

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Mathematics WAEC 1997

P varies inversely as the square of W. When W = 4, P = 9. Find the value of P when W = 9

  • 729/16
  • 6
  • 4
  • 16/9 checkmark
  • 4/3

The correct answer is: D

Explanation

P ฮฑ 1/w2; P = K/W2
9 = K/42; 9 = K/16
K = 9 x 16 = 144
P = K/W2; when w = 9
P = 144/92 = 144/81 = 16/9
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