At the beginning of a trip, the mileage odometer read 56,20056,200 miles. The driver filled the gas tank with 66 gallons of gasoline. During the trip, the driver filled his tank again with 1212 gallons of gasoline when the odometer read 56,56056,560. At the end of the trip, the driver filled his tank again with 2020 gallons of gasoline. The odometer read 57,06057,060. To the nearest tenth, what was the car's average miles-per-gallon for the entire trip

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First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )