Find the unknown angles. An explanation would be nice, but you don't have to.

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

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?

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.