The answer would be choice 2 : Function 2 shows a greater rate of change, because Edwin spends $9 each month and Adam spends $7 each month.
I found this out because for Adam, you simply subtract the y-coordinates from each other and get 7 each time. Edwin clearly shows that he Spends $9 each month with the negative sign.
Answer:

Step-by-step explanation:
Given:
Simplify The given choice.




Therefore, the first option
is correct.
Answer:
The question has some details missing. Here is the given function ; f(x,y,z) = 1 + 4xyz at point P = (1,-1,-1)
Step-by-step explanation:
The detailed steps and appropriate calculation is as shown in the attached file.