First option. gboicboybkivnjonn
The radius r used in below equations would equal 2in because it is half the given diameter of 4in.
The volume of the cone would be

The volume of a cylinder with the same dimensions would be

The cylinder is 24 - 8 = 16 cubic inches greater.
You are trying so solve
<span><span>3^x</span>=8</span>
and since 8 is not an integral power of x you need a calculator.
it is <span><span>ln(8)/</span><span>ln(3)</span></span>
or
<span><span><span>log(8)/</span><span>log(3)</span></span></span>