7. A. -18 cm, because it changes -3 cm/per year, so multiply 6 years by -3 cm to get -18 cm
8. D. $20, because it rose +$2 over 10 days, you multiply 10 days by $2 to get $20 total
I think it is A because that seems like the one making the most sense
<span>-7(7m-4)=77
Use distributive property(Multiply -7 by 7m and -4)
-49m + 28= 77
Subtract 28 from both sides
-49m= 49
Divide -49 on both sides so that the only thing remaining on the left side is the variable m.
Final Answer: m = -1</span>