Show a different way to solve 25 x 28

And explain how you got it so i can understand future problems : 3

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 can you construct perpendicular lines and prove theorems about perpendicular lines