The surface area, s, of a sphere of radius r feet is s = s(r) = 4πr^2. find the instantaneous rate of change of the surface area with respect to the radius r at r = 8.

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

Evaluate the function , when d = {9, 15, 30}. r = {5, 7, 12} r = {6, 10, 15} r = {6, 10, 20} r = {5, 12, 20}

The longer leg of a 30-60-90 trangle is 18