Mike had thirty seven dollars to spend on eight books. After buying them he had seventeen dollars. How much did each book cost ?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

If f(x)=x^2- 4 and g(x)=x^2 plus 2 x, (c) (f-/3) = ? (simplify your answer.)

Robert is replacing sod in two square shaped areas of his backyard. one side of the first area is 7.5 feet. one side of the other is 5.7 feet. the sod costs y dollars per square foot.