PLEASE HELP I will give brainliest I promise only if it’s correct and if it’s not I will report because this is very important to me thanks

Step-by-step explanation:

1) Price of 8 pack of toothbrushes = $ 18.12

Price he paid after using coupon  = 18.12 - 3  = $ 15.12

Unit rate = Price he paid ÷ number of toothbrushes

              = 15.12 ÷ 8

              = $ 1.89

2) 0.5 hours = 30 minutes

Duration of guitar class on Monday = 30 minutes

Duration of guitar class on Tuesday = 1.5 hours = 1 hr 30 min

Duration of guitar class on Thursday = 2 hrs

Total duration  = 30 min + 1hr 30 min + 2 hrs

                         = 4 hrs

Amount paid for 4 hrs = $ 180

Rate per hour = 180 ÷ 4

                       = $ 45

hdjd

step-by-step explanation: