On a field trip, there are 2 girls for every 3 boys. If there are 20 kids total, how many girls are there?

Closing a credit card usually _your debt ratio.a. increasesb. decreasesc. improvesd. has no effect on

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) = .

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x