3 5/12 - 8/12 this is a fraction pls provide a explanation

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

Manuela solved the equation below. what is the solution to manuela’s equation?

Plz me so yeah i rly don't get this