I would appreciate it if you could answer all these questions because I really don't understand anything this page is asking for

7. A store sells 120 portable speakers every month for $100 each. The owner of the store wishes to increase her profit and estimates that for every $2 increase in the price of speakers, one less speaker will be sold each month. Let p represent the price for one speaker. Let x represent the number of speakers sold per month. Let n represent the number of $2 increases in price. a) Determine the demand, or price, function, p(x). [2] (X-1) =100 b) Determine the revenue function. [1] B/ x ) = 100% c) Determine the marginal revenue function. [1] d) Solve R'(x) = 0. [1] e) Interpret the meaning when R' (x) = 0. [1]