+318 Y varies directly as the square of R. if y=7 when r=4, find y when r=28
MULTIPLE CHOICE WHICH ONE???
A) y=kr^2
b)y=kR
c)y=k/R^2
d) y=K/R
2) the quantity indicated is ____????
+36916 y = k r^2 if y = 7 and r = 4 find 'k'
7 = k (4^2) so k = 7/16
y = 7/16 r^2 now if r= 28 y = ?
y = 7/16 (784) = 343
