Find the surface area of a cylinder with a height of 9 inches and a base radius of 4 inches

A≈326.73in²

Explain:

The answer is part a: use

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?