Eight friends went to a hockey game. the price of admission per person was $x. four of the friends paid an extra $6 each for a player guide book. write and simplify an expression that represents the total cost.

How many liters of peroxide should be added to 12 liters of an 8% peroxide solution so that the resulting solution contains 16% peroxide?   original added new amount of peroxide 0.96 liters x 0.96 + x amount of solution 12 liters x 12 + x 0.18 liter 1.14 liters 1.92 liters 2.10 liters