Which equation best represents the line on the graph

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.

The radius of a sphere is 3 inches. which represents the volume of the sphere?

52 cm radius = diameter = area = circumference = circumfer