Tell whether each number is rational or irrational: pi, -1/2, the square root of 2/3, and 0.57575757

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.

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length