Answer all please tysvm.

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.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Me. i can't figure out this question. give an explanation too. .