To multiply polynomials, i do what?

Alana has 12.5 cups of flour with which she is baking four loaves of raisin bread and one large pretzel. the pretzel requires 2.5 cups of flour to make. how much flour is in each loaf of raisin bread? explain the steps to follow to get the answer.

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83

How do i i solve this equation? -18 = x/3 + 3