7) In a warehouse, boxes have been stacked in 4 layers as shown. The workers make other stacks according to the same pattern. If a stack has "n" layers, how many boxes are in the bottom layer? Write an expression.

Candice uses the function f(t)=t+100−−−−−−√ to model the number of students in her after-school program. the variable t represents days and f(t) represents the number of students. how many days does it take for there to be 15 students in her program? a. 225 days b. 125 days c. 325 days d. 115 days