Tory had $20 to buy a birthday present for her dad. she decided to buy a dvd for $18. the sales tax is 7%. does she have enough money?

Ifigured out the question and i dont know what to put here

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

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.