The formula for the volume of a cone is V = 1/3π r² h. Which equation correctly solves for h?

Start with $V=\frac{1}{3}\pi r^2h$. Multiply both sides by $3$ to remove the fraction: $3V=\pi r^2h$. Then divide both sides by $\pi r^2$: $h=\frac{3V}{\pi r^2}$, choice C. Choice B ($\frac{V}{3\pi r^2}$) leaves the $3$ in the denominator, though it should multiply $V$. Choice A ($3V\pi r^2$) multiplies by $\pi r^2$ rather than dividing. Choice D ($\frac{\pi r^2}{3V}$) is the reciprocal of the correct answer. A good check is to substitute $h=\frac{3V}{\pi r^2}$ back into the formula, which gives $V$.