What is the equation of a circle centered at the origin with radius 20? a. x3 + y3 = 400 b. x3 + y3 = 20 c. x2 + y2 = 20 d. x2 + y2 = 400

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.

Find the value of x that will make l ll m

Ineed i been stuck on this question since yesterday