PLZ HELP! Select all the correct answers. If the measure of angle 0 is 2π/3 , which statements are true?
The measure of the reference angle is 60°
o
cos(8) =
sin() = -1
o 8
IN
The measure of the reference angle is 30°.
tan(0)
= -V3
O The measure of the reference angle is 45º.

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?

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !