Hank has read 25 percent of his book. If Hank has read 150 pages, which equation can be used to find the total number of pages in the book?

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

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) = .

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges