A bag has 15 marbles—5 blue, 8 green, and 2 red. One marble is drawn from the bag and then replaced, and this action is repeated 20 times. The results are recorded in the table. What is the experimental probability in the simplest form of selecting a blue marble from the bag? A. 1/20
B. 7/20
C. 1/3
D. 3/5

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?

Ineed the solution to this problem and the steps.