Ericka and her friend are going to reshelf library books. sherri will reshelf 50% and ericka will reshelf 2/5 of the books. if there are 80 books to reshelf, how many will be left?

Prove the converse of the pythagorean theorem using similar triangles. the converse of the pythagorean theorem states that when the sum of the squares of the lengths of the legs of the triangle equals the squares length of the hypotenuse, the triangle is a right triangle. be sure to create and name the appropriate geometric figures.