Answer:
If Bo is riding for 9 miles, the cost of the taxi ride would be:
$3 pickup fee + $2/mile x 9 miles = $3 + $18 = $21
To find the cost of a taxi ride that is "m" miles long, the cost would be:
$3 pickup fee + $2/mile x m miles = $3 + $2m
Therefore, the cost of a taxi ride that is "m" miles long would be $3 + $2m.
hope it helps you