F incenter hope this helps
You need to set up a linear graph. One side with gallons and the other with dollars. Point 1 will be at (1500, 2.10). Point 2 (1300, 2.95). Draw a straight line through these points in your graph and your graph will then give you the answers to your other questions.
42 square ft because 4 times 3 is 12 and 10 times 3 is 30. 30+12=42
138 x ? = 75
? = 75/138 = 0.544(3sf)
so about 54.35% (2dp) decrease
