The volume formula of a cone is \(\frac{1}{3} \pi r^{2} h\) the r is the radius and h is the height. However, if you multiply by pi, you will get an approximated volume of the cone. So we will multiply like this for now. \(\frac{1}{3} r^{2} h\) Don't worry, we'll use pi in the end.
I'm going to assume that 7 inches is your radius. We need to plug in 7 for r and 4 in for h into the equation. Once we do that, it will look like this. \(\frac{1}{3} 7^{2} 4\)
\(\frac{1}{3}\) means we will need to divide one by 3. That gives us 0.33333... now we have to multiply by \(7^{2}\) we get 16.33333... now the last thing we need to do is multiply by 4, which is h. We get 65.33333. Add pi and you have your answer. \(65.333333333 \pi\)