The expression (3 x +8) , (2 x + 7) , and (5 x + 4) represent the lengths of the sides of a triangle. what is the distance around the triangle?

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