Maria filled 4 jars with jam using 3 pounds of strawberries. Which proportion can be used to find out how many jars Maria can fill with 9 pounds of strawberries?

What is the multiplicative rate of change of the exponential function shown on the graph?

Which of the following describes the symmetry of the graph of y = x3?

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) = .