It is moving away from earth.
explanation: when an object moves away from us the light shifted to the red end of the spectrum as its wavelengths get longer
Since there are 9 marbles and 2 are black, the number that are 'not black' is 7.
So the odds of picking a 'not black' marble is <u>7</u> , or D
9
-2(-2)+3=7
-2(0)+3=3
-2(4)+3=-5