How do I make both equations from this?

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.

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

35 ! insert < , > , or = to make the sentence true. 12 __ 25 > =