To solve this problem you must apply the proccedure shown below:
1. You have that Jim drove the car 2,718.3 miles for a total mileage of 87,416.
2. Then, to calculate the mileage before last month, you only need to substract the total mileage given in the exercise above and the mileage drove last month, as following:

Therefore, the answer is: 84,697.7 miles.
To find the diameter, you use the formula: 2x. we use 2x because the radius is 2 times the diameter.
so, if the radius is 3,980, then we substitute that into the formula.
2(3,980)
this will give us 7960. the diameter is 7960 miles.
About 3.5675 i need more characters so toodles
<u>First let's calculate the exponents.</u>

<u>Now we should multiply and divide.</u>
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<u>Now we should add and subtract.</u>
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<u>Convert the improper fractions into mixed numbers.</u>
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<u>Answer : </u>
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