Simplify this expression 1/3(21m 27) a. 7m 27 b. 7m 9 c. 63m 9 d. 7m 81

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 best describes the delian problem?

Could someone me with this question i’ve been stuck on it for 20 minutes