the population of two communities are 1.8705*10^6 and 9.00846*10^6. calculate, correct to four significant figures, the total population of the two communities.

Evaluate the expression. (9 + 5)(3 + 2)0

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) = .

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take