Ignore my work please. I really need help on part d and e!!!

3. The price p (in dollars) and the demand x for a particular steam I x = 1000 - 2p . - 000 Domain : 05 x 5/000 a) Express the price p in terms of the demand x, and find the domain of this function. X = 1000 - ZP - - 2 p = X - 1000 - 2 Sop = X- 100 0 - 1000 - 1000 - 2 p ( x ) -_ 1X - 2 + 500 b) Find a function that computes the Revenue from the sale of x steam irons. r ( x ) = X ( - = + SOOx) - 150OX R ( x ) + 50Ox c) Find the number of steam irons that maximizes revenue. * = - b 500 soo steam -SOO = 500 Irons will maximize 2 revenue d) What will the marginal revenue be when the revenue is maximized. Why? 509- 7000 IP , 2 p e) Find the instantaneous rate of change of revenue at 400 steam irons. Interpret the result