If y varies inversely as x^2 and y = 3 when x = 18, what is y when x = 3?a. 6 b. 108 c. 54 d. 27

y*x^2=k
y=3, x=18 ⇒ 3*18^2=3*324=972=k
x=3, 972=y*x^2=y*9
y=972/9
y=108