The number 64 has the property that it is divisible by its units digit. How many whole numbers between 10 and 50 have this property?

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) = .

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.