"9. if a is a non-zero constant, determine the vertex of the function y = -x2 + 4ax + 3 in terms of a. a) (2a, 4a2 + 3) b) (-2a, 12a2 + 3) c) (a, 3a2 + 3) d) (-a, -5a2 + 3) e) none of these

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.

Ill mark the brainliest if you me with the these three questions 7,8,9

You need to solve a system of equations. you decide to use the elimination method. which of these is not allowed? 3x - 2y = 7 3x + 4y = 17 equation 1 equation 2