Answer:
6m-mn, or 5m-n.
7y+42+5y+30, or 12y+72.
Not sure exactly what you're asking for the third and fourth, but these are the first two simplified.
Answer:
x - 40
10 - 400
Step-by-step explanation:
I'm pretty sure the rule is x • 40 = y (or input • 40 = output)
Answer:
Price for what?one cup or?
Answer:
The answer is D.
Step-by-step explanation:
You have to make x as a subject by substracting 4 on both sides :
15 < 4 + x
15 - 4 < 4 + x - 4
11 < x
x > 11