What is equal groups division with an unknown multiplier mean?

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.

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

If you had $1,900,000, how many days would it take you to spend all if you spent $1 a second. (there are 86,400 seconds in a day)