In his first five basketball games, neal scored 10, 11, 11, 12, and 16 points. what is the mean absolute deviation for this set of scores?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Which number line represents the solution set for the inequality - x 24?

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) = .