Square Roots with Exponents

Question

I learned about Square roots and with exponents, but not this:

The radius $r$ in millimeters of a platinum wire $L$ centimeters long with resistance $0.1$ ohm is $r = 0.059L^\frac 12$. How long is a wire with a radius of $0.236$ millimeter?

Answer 1

$$.236=.059L^{\frac{1}{2}}=.059\sqrt{L}$$

and then solve as you would any simple equation