Answer:
1.E, F
2. ↔ AE
3. X
4.Y
Step-by-step explanation:
1. Given (12+3)x, we can sum the numbers in the parenthesis to get 15x
2. Given 12x+3x, we can factor x to get (12+3)x and get the same as 1.
3. Given (12+3x)x, we have to distribute the x and we have 
4. This expression is already simplified.
To find what percent of 1,200 is 9, you need to divide 9 by 1,200 and then move the decimal two places to the right.
9 / 1,200 = 0.0075
Moving the decimal two places to the right gives us 0.75, so now you add a percent sign to the end.
.75% of people said they wouldn't go to see the band again.
Hope I was able to help! :)
N is greater than or equal to 5
So that is the first one.
Hope that help you.