A construction crew is lengthening a road that originally measured 51 miles. The crew is adding one mile to the road each day.

Let L be the length (in miles) after D days of construction.

Write an equation relating L to D. Then use this equation to find the length of the road after days.

equation:
length of road after 26 days :

L = 51 + D

After 26 days,
L = 51 + 26
L = 77

Therefore, the length of the road after 26 days of construction is 77 miles.