Athree digit number is divisible by seven and 10?

Describe all the numbers that when rounded to the nearest thousand are 645,000

Which of the following expressions are equivalent ?

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.