Astore owner buys backpacks at a certain price and sells them at a higher price. the differences is called the markup. if she pays $21 for a backpack and adds a 40% markup on the price she paid what the selling price

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