Suppose a car burns 1 gallon of gas in 25 miles. How much gas will be burned on a trip of 400 miles.
1 answer:
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The sequence is geometric, so
for some constant r. From this rule, it follows that
and we can determine the first term to be
Now, by substitution we have
and so on down to (D)
(notice how the exponent on r and the subscript on a add up to n)