Write the Expression " R Varies Directly with the Square $R = k \sqrt { x }$

Multiple Choice

Write the expression " R varies directly with the square of x " in symbols.

A) $R = k \sqrt { x }$
B) $R = \frac { k } { \sqrt { x } }$
C) $R = k x ^ { 2 }$
D) $R = \frac { k } { x ^ { 2 } }$