Adrian wants to keep track of how much water he is using to water his garden each week. He recorded how much water he used each week in a table. Week 1 Water usage (gallons) 12.4. Week 2 water usage (gallons) 16.5. Week 3 water usage (gallons) 14.1. Week 4 water usage (gallons) 13.8. 1. Calculate the average amount of water Adrian used to water his garden during the four weeks. Show your work. 2. Express the answer in a complete sentence.