Answer: please post your answer choices and then I can help
Step-by-step explanation:
If u tell me the solution's like are u evaluating or what, which method is it i can tell u the answer <span />
For this case we have a function of the form:

Where,
A: initial amount
b: decrease rate
x: time in days
Substituting values we have:

Therefore, the graph of the function is a decreasing exponential function in the first quadrant and that has an initial value of 40.
Answer:
graph of exponential function going from left to right in quadrant 1 through the point 0, 40 and approaching the x axis
All we need to do is plug the numbers into the equation.
A:

Not A.
B:

Not B.
C:

C is the correct answer