The volume formula of the cylinder is:
we can leave the π as a variable or by 3.14 depending by your teacher..
Given the values, substitute
V=π(30 m)²(75 m)
PEMDAS meaning parenthesis first, and next is exponent, before multiply
V=π(900 m²)(75 m)
If your teacher doesn't accept π, and wants 3.14, just substitute
Hope this helps =)