solve 32. a b and c

32. Figure 1.7 shows the fuel consumption (in miles per gal- lon, mpg) of a car traveling at various speeds (in mph). (a) How much gas is used on a 300-mile trip at 40 mph? (b) How much gas is saved by traveling 60 mph instead of 70 mph on a 200-mile trip? (c) According to this graph, what is the most fuel- efficient speed to travel? Explain. fuel consumption (mpg) 40 30 20 10 10 20 30 40 50 60 70 80 90 100 speed (mph) Figure 1.7