First you need to know how much each guest will eat
yes I know but will not give answer because you have not say that
Answer: dependent
Step-by-step explanation:
You're correct, the answer is C.
Given any function of the form

, then the derivative of y with respect to x (

) is written as:

In which

is any constant, this is called the power rule for differentiation.
For this example we have

, first lets get rid of the quotient and write the expression in the form

:

Now we can directly apply the rule stated at the beginning (in which

):

Note that whenever we differentiate a function, we simply "ignore" the constants (we take them out of the derivative).
X = A/y
You divide the y from both sides
The y on the right cancels
On the left you have A/y = x