A roll of paper towels is wound around a hollow cardboard tube. The cardboard tube in the middle of the roll has an outside radius of 2.37 centimeters. The thickness of the paper is 0.03 centimeters. The sequence of distances of the loops of paper away from the center of the roll, in centimeters, is the following: a1, a2, a3, a4, a5, ... = 2.40, 2.43, 2.46, 2.49, 2.52, ... What is the radius of the 85th loop of paper, starting from the center of the tube?

Question

A roll of paper towels is wound around a hollow cardboard tube. The cardboard tube in the middle of the roll has an outside radius of 2.37 centimeters. The thickness of the paper is 0.03 centimeters. The sequence of distances of the loops of paper away from the center of the roll, in centimeters, is the following:  a1, a2, a3, a4, a5, ... = 2.40, 2.43, 2.46, 2.49, 2.52, ...  What is the radius of the 85th loop of paper, starting from the center of the tube?

anonymous · Answer

4.92