martinezarianna54453 martinezarianna54453 13-04-2021 Mathematics contestada 6. A plumber charges $45 for travel and $60 per hour. The cost for h hours can be found using this expression. 60h + 45 What is the total cost of a repair that takes 3 hours? OA. $648 OB. $225 OC. $165 OD. $108