PLLEASEE HELP :)!
The price p and the quantity x sold of a certain product obey the demand equation below.
x=-4p+80, 0≤ p≤ 20
(a)Express the revenue R as a function of x.
(b)What is the revenue if 44 units are sold?
(c)What quantity x maximizes revenue? What is the maximum revenue?
(d)What price should the company charge to maximize revenue?
(e)What price should the company charge to earn at least $364 in revenue?

i think 1: 2

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answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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