Answer: C
Step-by-step explanation:

So, the original fraction is equal to

Answer:

Step-by-step explanation:
You need to apply the chain rule here.
There are few other requirements:
You will need to know how to differentiate
.
You will need to know how to differentiate polynomials as well.
So here are some rules we will be applying:
Assume 




Those appear to be really all we need.
Let's do it:






I tried to be very clear of how I used the rules I mentioned but all you have to do for derivative of natural log is derivative of inside over the inside.
Your answer is
.
Answer: C.) 6 feet describes the center, and 9 feet describes the spread.
Step-by-step explanation: Center is the median/mean, spread is the range. If I am reading this right, they basically gave the answer to you. The mean is 6 feet, and the range is 9 feet. I hope this helps you! If I got it wrong, please let me know so I can correct my errors.