An amendment to the u. s. constitution must be ratified by at least three fourths of the states to become law. write this ratio as a percent.

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

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) = .