Una persona tenía k años hace m años. ¿Cual sera su edad dentro de n años?

Me because some of question i don’t understand

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 value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64