Find the values of x and y. explain your reasoning by stating the proper theorem or postulate

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.

If you answer right ill give brainliest, : )

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list