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avatar+414 

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 ____????

 Mar 10, 2020
 #1
avatar+21725 
+1

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

 Mar 10, 2020

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