Joanne and her friends went on a hiking vacation to the nati…
Joanne and her friends went on a hiking vacation to the national park. They covered 2 miles on the first day. They went on a 4-mile hike and an 8-mile hike on day 2 and day 3, and the hiking distance continued to increase. How many miles did Joanne and her friends hike on the 7th day?