A painting crew bought 30 gal of paint for a job. The crew members used 3 gal of paint per hour until they used all the paint. Which sketch represents this situation?

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.