A construction crew is lengthening a road. The road started with a length of 52 miles, and the crew is adding one 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 equation relating L to D . Then use this equation to find the total length of the road after the crew has worked 26 days.

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?