18 erasers cost $0.90, how much would 3 erasers cost?

How to determine whether two known pairs of points are on the same line.

The trigonometric ratios sine and secant are reciprocals of each other

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