I need help please its just fill in the blanks see the image. it's due really soon so a prompt answer would be beneficial.

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

Answer this question i need as soon as possible

Y= a(x-3)squared-1 what is the value of a