If all students scored the same the score of each student would be 4.5.
Answer:
d. not a real number
Step-by-step explanation:
it is not a real number because theres a negative under root
Answer: He read 40% of the total time.
Step-by-step explanation:
As per given,
Total time he spent = 2 +1+2 = 5 hours
Number of hours he spent on reading = 2 hours
The percent of the total time he read = 

i.e. The percent of the total time he read = 40%
Hence, he read 40% of the total time.
You factor out the number of common x's and the common number 4.