A construction crew is lengthening a road. The road started with a length of 56 miles, and the crew is adding 4 miles to the road each day. Let L represent the total length of the road (in miles), and let D represent the number of days the crew has worked. Write an equation relating L to D . Then use this equation to find the total length of the road after the crew has worked 36 days.
Equation: ____
Total length of the road after 36 days: ___miles