Explain the connection between D2 and DB

What is not true about kl and mn? what is mn? (show your work)

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?  

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.