Answer:
a -6r+6
Step-by-step explanation:

Use - to expand the bracket

Group like terms and simplify

Answer:
Gus
Step-by-step explanation:
I got 5,300. I’m not sure if that’s what you meant for “d”.
Answer:
c. 1 3/20
Step-by-step explanation:
a guess hopefully you are right
Answer:
3026
30
Step-by-step explanation: Average sum of the female and male's test score is the sum of expected value of each gender:

Assuming x represents the random male selected and y represents the random female selected:

3026
The average sum of their scores is 3026.
Average difference is the difference between the expected value (mean) of each gender:

1528 - 1498
30
The average difference of their scores is 30.