Determine the product. Write your answer in scientific notation. (2 x 105)(5 x 102) 10 x 1010 O 1x 108 O 7× 107 O 7× 1010​

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.