Write an equation of the line in slope intercept form

If f(x)= 3x+6 which of the following is the inverse of f(x)

What is the y-intercept of the line given by the equation

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