HELP DUE IN A HOUR!! please no links !

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

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

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