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
Answer:
3 3/8
Step-by-step explanation:
4 5 27
--- - ----- = ------- or 3 3/8
1 8 8
Answer:
x>-23/7
Step-by-step explanation:
-23<7x
7x>-23
x>-23/7
the answer is x>-23/7