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what is the coefficient of r in the following expression? c + 2r + 3

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.

Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?