If you formed an algebraic equation to model the sentence, three times a number is equal to nine, how many variables would be in the equation?

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

Which statement justifies why angle ebc measures 90?