Which of the following numbers must be added to complete the square in the
equation below?
x^2+9x+15-11

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

I’m still confused on how to work the percentages

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.