PLEASE HELP ME, I REALLY NEED HELP CUZ THIS IS DUE IN LESS THAN AN HOUR. WILL MARK BRAINLIEST, PLS HELP ME

Which best explains why this triangle is or is not a right triangle?

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?  

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?