Which of the following is equal to the rational expression when x is not equal to 5 or -3?

x^2+x-6/x^2-2x-15

a. x-2/x+3

b. x+3/x-5

c. x-6/x-5

d. x-2/x-5

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