PLEASE HELP I WOULD REALLY APPRECIATE IT!

The school that imani goes to is selling tickets to the annual dance competition. on the first day of the ticket sales the school sold 7 adult tickets and 5 child tickets for a total of $96. the school took in $40 on the second day by seling 3 adult tickets . find the price of an adult ticket and the price of a child ticket. solve by using substitution elimination college prep algebra math heres the 2 equations i came up with 7x+5y=96 and 3x+2y= -40 show all workiv be stuck on this.

How many terms does the polynomial x^2 y^2 have

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?