Free points lol s u ye

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.

Which of the following expressions is equal to 2x^2+8

Which of the following graphs could represent a cubic function?