What is the answer to The sum of 2 numbers is 19 and their difference is 3? And thank you for helping. I need the answers correct because I play prodigy, a math game. Thank you!

Which rational number could be graphed between -4 and -5

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) = .

How can you construct perpendicular lines and prove theorems about perpendicular lines