Ad and ac are opposite rays.
true
false

False

Step-by-step explanation:

For AD and AC to be opposite rays they must be on the same straight line in opposite directions.

Mr. William is incorrect. He did not distribute the subtraction sign correctly.

Step-by-step explanation:

(3x^2+2x+1)-(x^2-3x+4)

3x^2+2x+1-x^2-3x+4

It's supposed to be, -x^2+3x-4 because you have to distribute the negative sign.