Prove that the sum measures of the interior angles of a triangle is 180

Solve the following: 12(x^2–x–1)+13(x^2–x–1)=25(x^2–x–1) 364x–64x=300x

Divide reduce the answer to lowest term 3/7 divided 1 1/6

Andy has $310 in his account. each week, w, he withdraws $30 for his expenses. which expression could be used if he wanted to find out how much money he had left after 8 weeks?