Ella and 3 friends are going ice skating. They hire 4 pairs of ice skates for 3 hours. The formula below is for working out the cost of hiring the stakes including a deposit.
C=s(3h+5)
C
 = total cost
s
 = number of pairs of ice skates
h
 = number of hours
How much will it cost to hire 4 pairs of ice skates?