Find the 6th term 8 20 50

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

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.