PLS HELP VERY EASY 10 POINTS

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

In the diagram of circle o, what is the measure of zabc?

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