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Calculus The marketing department for a cell phone telephone company has determined that the demand for...

Calculus
The marketing department for a cell phone telephone company has determined that the demand for their phone obeys the following relationship: p= -0.02+200 , (0 ≤ p ≤10,000) , where p denotes the phone’s unit price (in dollars) and x the quantity demanded. This type of question is much easier when you use your calculator, I just need to know what you did when you give me an answer using it,
(a) Express the revenue as a function of x: Round all of the following answers to the nearest penny when necessary.
(b) Find the rate of change in the revenue between the 2,000th and 4,000th phone.
(c) Find the rate in change of revenue from the sale of the 5,118th phone.
(d) Find the exact revenue from the sale of the 815th telephone.
(e) Use the marginal revenue function to estimate the revenue from the sale of the 815th phone. (f) Find the average revenue from the sale of 3000 phones.

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