A way to add fractions that always works is to multiply each numerator by the denominator of the other, then express the sum of products over the product of the denominators.

Here, you have
The sum is -1 1/12
V=pir^2(h/3)
V= 3.14x18^2x6/3
V= about <span>2034.72</span>
It would be 22 x 3.14 = 69.08 i’m pretty sure lolol sorry if i’m wrong
There Are 3 Groups Of 10 With 8 Rocks Left Over