If p and r are integers, and p^2 = 14r, then r must be divisible by which of the following?	Choose the correct choice.
A) 2
B) 4
C) 5
D) 7
E) 14
Ans: D   Solution: for p to be an int 14 r must be whole square of a number.   14r= 7*2*r   to make it whole square we need 7   so r can must be divisible by 7y where y is itself a whole square.   so 7 is the ans
<result>D</result>
If p and r are integers, and p^2 = 14r, then r must be divisible by which of the following?