What is the GCF of 18x ^2 −33x+12

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Im literally having a mental breakdown

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32