Which of the following systems of inequalities would produce the region indicated on the graph below?
I’ve been on this for like 15 minutes please someone help me .

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges