the volume of a right cone can be found by the formula
[tex]V=\pi\cdot r^2\cdot\frac{h}{3}[/tex]replace in the formula
[tex]\begin{gathered} V=(7.9ft)^2\cdot\frac{(15ft)}{3}\cdot\pi \\ V=\pi\cdot312.05ft^3^{} \end{gathered}[/tex]multiply and round to find the final result
[tex]\begin{gathered} V=980.333ft^3 \\ V\approx980.3ft^3 \end{gathered}[/tex]