please answer #6 with the full work. if not the work please provide an explanation. I will make you the brainiest.

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

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.