Identify the independent variable and dependent variable in the situation: Wait time, w, and the number of people in line to get on a ride, p.
Independent variable
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Dependent variable
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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) = .

Can you me find the missing length. i attached an image.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?