If x, y and z are the first three terms of an geometric sequence, show that x^2,y^2 and z^2 form another geometric sequence

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

The graph of f(x) = |x| is transformed to g(x) = |x + 11| - 7. on which interval is the function decreasing?