Megan bought 3 pounds of apples that cost x dollars per pound. She gave the cashier a 20-dollar bill. Which equation could Megan use to find the amount of change, y, she should receive?

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