Answer:
42 miles...One long walk.
1 * 6 = 6.
3.5 * 6 = 21.
There AND back so 21 * 2 = 42.
try the third option
Step-by-step explanation:
At least I'm trying
2n-7+12n-9
combined like terms 2n+12n and -7-9
your answer is 14n-16
A