A rectangle pool has an area of 880ft the length is 10ft longer than the width. find the detentions of the pool solve by completing the square. round answers to the nearest tenth

100 points, hi, i’m not sure how to get the equation from the graph and table.

Is the square root of 4 plus the square root of 16 rational?

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .