51 cm your welcome hehehe

or you can turn it like this...
![V=36\pi\ ft^3\\\\V=\dfrac{4}{3}\pi r^3\\\Downarrow\\\\\dfrac{4}{3}\pi r^3=36\pi\ \ \ |:\pi\\\\\dfrac{4}{3}r^3=36\ \ \ |\cdot3\\\\4r^3=108\ \ \ \ |:4\\\\r^3=27\to r=\sqrt[3]{27}\to r=3\ ft](https://tex.z-dn.net/?f=%20V%3D36%5Cpi%5C%20ft%5E3%5C%5C%5C%5CV%3D%5Cdfrac%7B4%7D%7B3%7D%5Cpi%20r%5E3%5C%5C%5CDownarrow%5C%5C%5C%5C%5Cdfrac%7B4%7D%7B3%7D%5Cpi%20r%5E3%3D36%5Cpi%5C%20%5C%20%5C%20%7C%3A%5Cpi%5C%5C%5C%5C%5Cdfrac%7B4%7D%7B3%7Dr%5E3%3D36%5C%20%5C%20%5C%20%7C%5Ccdot3%5C%5C%5C%5C4r%5E3%3D108%5C%20%5C%20%5C%20%5C%20%7C%3A4%5C%5C%5C%5Cr%5E3%3D27%5Cto%20r%3D%5Csqrt%5B3%5D%7B27%7D%5Cto%20r%3D3%5C%20ft%20)
Answer: The radius r = 3 ft.
Step 1
Given; The table below
Required;
Step 2
A quadratic equation is an algebraic equation of the second degree in x. The quadratic equation in its standard form is ax² + bx + c = 0, where a and b are the coefficients, x is the variable, and c is the constant term.
If the graph has a negative value for a then it will look like that seen below;
This graph is from the table
The answer thus will be;
Replace a and b with the given values:
3.14(3^2 + 3x4)
Simplify:
3.14(9 +12)
3.14(21)
Multiply:
3.14 x 21 =65.94