Solve the quadratic equation by the square root property 6x2=54

In an experiment you are to flip a two sided coin 100 times and record 55 heads up and 45 tails up determine the theoretical and experimental probability of getting a heads up in the experiment.

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6