What is the equivalent exxpression of 8b+8-4b-3

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a