Charlie thinks the following sequence can be modeled by the functions

f(1)=5
f(2)=10
f(3)=17
f(n)=f(n-1) + n^2

question 2.
Charlie would like to know the explicit formula to describe the sequence. enter your explicit function in the space below use the variable end for the nth term

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.