Answer:
5he slope is also known as the constant - of change
Carry out the operation in the brackets and then follow the order of operations and then you can figure out the answer.
18 is the solution.
I think it’s D) 9 because when you find the mean of a set of values you are taking into account and adding all of the numbers, and then dividing them by how many numbers there is, so the mean would be summarizing all of them, hope this helps
The cost for 9 lbs would be 63 dollars