120 * .08= 9.6
120 - 9.6= 110.4
The one with domain {8, 3, 1} and range {6, 2, 7, 9}(top-left) is not a function because 3 is being mapped to two different values, 2 and 7.
Ray should buy the first one because it has the greater volume by 1,440 square inches.
Tank 1: 20x20x18=7,200
Tank 2: 40x12x12=5,760
7,200-5,760=1,440
111) 5:4
112) 3.6
113) -4
114) 0.3 units down, 0.4 units to the left