Answer:
x^4+2x^3y-3x
Step-by-step explanation:
Answer: 5/13
Step-by-step explanation:

Your fully factored expression should be 2*(8a+5).
The six scores have to average out to the mean, so their sum has to be six times the mean. Since the sum of the first five is 5 more than 5 times the mean, the remaining score must be 5 less than the mean.
Answer: 5 points below the mean