How do I find surface area by using algebra. (Like a formula in terms of using only one variable)

Will give brainliest summations with algebraic expressions image shown

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

What is x3+3x2−16x−48 divided by x−1?