First you create a proportion (30/100=x/120). After you solve this, next you subtract this answer from 120. Then create a proportion for 40% (40/100=x/120). Then add this number to the first answer you got when you subtracted the answer from your first proportion from 120.
Answer:
Step-by-step explanation:
1. 7x + 4
2. 3x - 2
It is D, not here because they are all dependent.