Who else is going to fail this year lol

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

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?  

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.