Find the Formula for the Function $p = 10 x ^ { 3 }$

Multiple Choice

Find the formula for the function.
-Express the perimeter of an isosceles triangle with side lengths x, 5x, and 5x as a function of the side length.

A) $p = 10 x ^ { 3 }$
B) $p = 11 x$
C) $p = 25 x ^ { 3 }$
D) $p = 10 x$