Explain why geometric sequences are exponential functions

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.

How to do this , and can some one explain

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?