Answer:
That guy is correct a because its both greater than and equal to 8
You first divide both numbers by 4 to get one quarter which is the unit, and to get the rate, you divide 15 by 4 also. i got the unit rate is 3.75 points oer quarter.
Get a graphing calculator
The domain is all real numbers, reason being, you can put any number for x and get a valid coordinate.