The value of y varies inversely as x^2 and when x = 24, y = 15 . What is x when y = 13?
y = k/x^2
yx^2 = k
15 (24)^2 = 8640
13 (x^2) = 8640
x^2 = 8640 / 13
x = 25.78 (taking the positive root)
+36916 
