Solve for r, V
r=7.5
V = \frac{1125 \pi}{2} \approx 1767.145867644
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V=\frac{4}{3}\pi \times 7.5^{3}
Consider the second equation. Insert the known values of variables into the equation.
V=\frac{4}{3}\pi \times 421.875
Calculate 7.5 to the power of 3 and get 421.875.
V=\frac{1125}{2}\pi
Multiply \frac{4}{3} and 421.875 to get \frac{1125}{2}.
r=7.5 V=\frac{1125}{2}\pi
The system is now solved.
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