13) You can fill 5 gallons per 1 minute. (hint:
gallons is y and minutes
is x)
Equation:

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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) = .