69 divided by 6.80 is 10.147
[Step 1] Put data in order least to greatest
-> Data is already in order, fantastic!
[Step 2] Find the medium of all the data
-> We will find the middle value
-> See attached, in black
-> The value is 7.5
[Step 3] Find the medium of our halves
-> We will find the middle value of each of the halves
-> See attached, in white
-> For this, the value of the first quartile it is 3.5
-> For the, the value of the third quartile it is 9
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
Answer:

Step-by-step explanation:
Plug in -3 for n in the equation:


Simplify. Remember to follow PEMDAS. First, solve the power:

Next, combine like terms. Note that if there are two negative signs directly next to each other, it becomes a positive sign. Add:

Your answer: 
<h2>
Hello!</h2>
The answer is:
1017.88 square feet are blue.
<h2>Why?</h2>
To calculate how many square feet are blue, we need to calculate the area of the bottom of the circular swimming pool.
We need to remember that we can calculate the area of any circle using the following formula:

Now, we know that the diameter of the bottom is equal to 36 feet, so, we can calculate the radius of the bottom using the following formula:

So,

Then, calculating the area we have:

Hence, we have that 1017.88 square feet are blue.
Have a nice day!