About how long will it take an investment to triple if it's annual interest rate of 8.5% is compounded continuouisly? (Round your answer to the nearest number of years)

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.