She is incorrect cause if we take the number 20 and take 25% of it it equals 5 so now 20 is only 15. They if we take 75% away from 20 is equals 15 so then we only have 5 from 20 left. Therefore she’s incorrect because 75% leaves 5/20 and 25% leaves 15/20. Hope that makes sense.
What do you mean doubling? You can add 7+7+7 which equals 21.
10% = 5
80% = 40
2% = 1
82% = 41
41
You should choose c because parallel lines have the same slope
It would be 4.9%, hope this helps :)
