Solve for the indicated variable.
-$c = 9 \sqrt { r }$ for $r$
A) $r = \frac { c ^ { 2 } } { 81 }$
B) $r = \frac { c } { 81 }$
C) $r = \frac { c ^ { 2 } } { 9 }$
D) $r = \frac { c } { 9 }$

Question

Quizplus · Accepted Answer

To solve for $r$, square both sides of the equation to get rid of the square root, resulting in $c^2 = 81r$. Then, divide both sides by 81 to isolate $r$, giving $r = \frac{c^2}{81}$.

Solve for the Indicated Variable c=9rc = 9 \sqrt { r }c=9r​

Solve for the Indicated Variable $c = 9 \sqrt { r }$