Find the percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or decrease.
62 trees to 31 trees
100% decrease 100%; increase 50%; decrease 50%; increase

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) = .

Use the distributive property -7(-2x+u-2)

25 ! what is the value of x? enter your answer in the box. x =