four friends use an online coupon to get a $15 discount on each concert ticket buy. they spent $312 for the four tickets. what was the price of one ticket without the discount?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.