Ican't figure out how to do this question. simplify the imaginary number in the picture above

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.

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)