How to find the rate of something lol

In a column proof the right column states your reasons

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer

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.