1over f equals 1 over a plus 1 over b for f

Solve the system of equations. y= 2x y= x^2 - 15

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.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?