450 people are waiting in a line to buy tickets for a concert, 2 cashiers can process 3 people in 1 minute. If there are 5 cashiers, how long will it take for the last person to purchase a ticket?

based on context clues you gave i'm assuming the answer would be c.

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

i got 10.28 but that rounds up to 10.3