A rain barrel is full of water and used to water a garden. The rain barrel loses water at the rate of 2.5 gallons per minute. After seven minutes, the rain barrel contains 37.5 gallons. Part A: How many gallons of water were initially in the rain barrel? Show or explain your work. Part B: Write an equation in point-slope form to model the number of gallons (y) of water in the rain barrel after (x) minutes. show or explain your work. Part C: If the rain barrel was full of water, how many minutes does it take for the rain barrel to drain so it contains 25 gallons of water? Show or explain your work. D.) What is the total number of minutes it will take to completely empty the rain barrel? Show or explain your work!