These two pygons are similar. z=what

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.

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3