Hello!
We first have to find the volume of the bigger cylinder
We use the equation [tex] \pi r^{2} h[/tex]
Put in the values you know
[tex] \pi 10.5^{2} *18[/tex]
This is 6234.49
Now we find the volume of the cut out part
[tex] \pi 7.5^{2} 18[/tex]
This is 3180.86
We subtract the two values
6234.49 - 3180.86 = 3053.63
The answer is 3053.6
Hope this helps!