The area of a rectangle is 120cm and its length is 12cm .Calculate the width of the rectangle

Which shows one way to determine the factors of  x3  +  5x2  –  6x  –  30 by grouping? x(x2  –  5)  +  6(x2  –  5)x(x2  +  5)  –  6(x2  +  5)x2(x  –  5)  +  6(x  –  5)x2(x  +  5)  –  6(x  +  5)

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*