Factor polynomial 4a^2-4a+1

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

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

Which equation represents h for right triangle abc