Any parts are fine I just need help T-T The demand function for a type of portable radio is given by the model d=85−6x2, where d is measured in dollars and x is measured in millions of units. The production cost is $25.00 per radio. Given that profit = revenue - costs answer the following parts. (Hint: Revenue is demand times number sold. Costs are productions costs per number sold.)

Part A: Write an equation giving profit as a function of x million radios sold.

Part B: The company currently produces 3 million radios and makes a profit of $18,000,000, but would like to scale back production. What lesser number of radios could the company produce to yield the same profit?