PLS HELP ASAP DOING A TEST
What is the diameter of a plate with circumference of 25 cm.?

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

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 1/2 x (6 x 4)+3 + 2 show your work