Answer:
0.25
Step-by-step explanation:
Average means 
According to the formula, each student in Mr. Goldwasser's class read

books on average, and each student in Mr. Welch's class read

books on average.
Therefore, the answer will be

1.732 is the square root of 3
Cheack the expononets may be it wrong harder to get
Consider for each point how far it is above (or below) the horizontal line y=2. Then plot its image the same distance below (or above) that line.