Answer:
C. 15
Step-by-step explanation:
1. First, let's solve the system of equations; 
Solve -m - n = 5 for m.
Substitute -n - 5 for m in m - n = -3.
Substitute -1 for n in m = -n - 5.
2. Okay, now that we know m = -4 and n = -1, let's solve for m^2 -n^2.
Therefore, the answer is C. 15!
Answer:
Catherine's sister ate 2/15 gallons of the ice cream.
.
Step-by-step explanation:
Let 
be the amount of ice cream that Catherine's sister ate, in gallons.
- Original amount: 1 gallon.
- What Catherine ate:
gallons. - What Catherine's sister ate is assumed to be gallons.
- What's left:
gallons.
Consider the relationship:
.
That is:
.
Add to both sides of this equation:
Substract from both sides:
.
Convert the denominator of all three numbers on the left-hand side to 
.
.
In other words, Catherine's sister ate gallons of the ice cream.
Well, there are 8 pints in gallon.
1+2+5= 1 gallon
1+2+5= 1 gallon
1+2+5= 1 gallon
1+2+5= 1 gallon
______________
4+8+20=4 gallons
4:8:20
I think the answer is 4/25 simplified to the lowest amount
7w + 3 = 5w + 9
Step 1:
Get the 3 to the other side by subtracting
7w = 5w + 6
Step 2:
Get the 5w to the other side by subtracting
2w = 6
Step 3
Divide
6/2 = 3
Answer is 3
