A support holds up a shelf on a wall. 1 2 Which describes the relationship between 21 and 22? A. alternate interior angles O d. supplementary angles B complementary angles O E. vertical angles Oc C. corresponding angles

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) = .

Whats the difference between -25 and 17

Ineed with numbers 8,9and10 answer fast i have 10 minutes