What percent of your pre-retirement earnings do most financial advisors say you'll need to comfortably maintain your pre-retirement standard of living?

60%
70%
80%
90%

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.