Answer:
$3.70 honestly just divide lol
One battery costs $1.44.
The unit rate would be

To get that answer, you would have to divide 13 ÷ 9.
I'm not sure if this is what you were looking for, but if it was, I hope I helped! :-)
Answer:
1.7(12) + 3(-6) = 84 - 18 = 66