Question

a construction crew is lengthening a road that originally measured 51 miles. the crew is adding one mile to the road each day. the length, ( l ) (in miles), after ( d ) days of construction is given by the following.
( l = 51 + d )
what is the length of the road after 18 days?

miles

Explanation:

Step1: Substitute d=18 into formula

$L = 51 + 18$

Step2: Calculate the sum

$L = 69$

Answer:

69 miles