Two triangles are congruent if two sides and the included angle of one are equal (or congruent) to two sides and the included angle of the other

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.

What is the remainder when 3x^2-x-10 is divided by x-1 -6,-7,-8, or -9

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2