A quadratic function has the form y=ax2+bx+c, in which a, b and c are specific numbers and a0. Three distinct points on the graph are enough to determine the equation. Suppose that (1, 5), (2, 10) and (3, 19) are on the graph of y=ax2+bx+c. Write a system of three variables and three equations.

Alex drew a circle with right triangle prq inscribed in it, as shown below: the figure shows a circle with points p, q, and r on it forming an inscribed triangle. side pq is a chord through the center and angle r is a right angle. arc qr measures 80 degrees.

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Which graph represents the equation y =4x