Answer:
2. 9 feet
3. Tomas added 6 to both sides of the equation instead of subtracting 6.
Explanation:
2.
We know that the length is 15 feet on one side, so plug it into the formula.
2(15) + 2w = 48
Now add, and then subtract 30 from both sides.
30 + 2w = 48
Then, divide by 2 on both sides.
2w = 18
Solve.
w = 9
To remove the 6, Tomas should have subtracted 6, because if he added 6 to both sides the equation would be...
12 + 6y = 18