Answer: I believe it would be 8 people who slept atleast 8 hours.
Step-by-step explanation:
4 sqrt(400) / 4 sqrt(5)
sqrt(400) =20
4 *20
--------
4 sqrt(5)
the 4's on the top and bottom cancel
20
--------
sqrt(5)
I was taught never to leave a sqrt in the denominator
so you need to multiply by sqrt (5) in the numerator and the denominator
20* sqrt(5)
--------
sqrt(5)* sqrt(5)
20* sqrt(5)
--------
5
= 4 sqrt(5)
Answer: The graph is attached.
Step-by-step explanation:
The region is limited by two lines:
and 
You can write the first inequlity
in the following form:

This region are all the values for which the y-axis is less than the line f(x)=x+6 (all the values under the line).
The other inequality x ≤ 4 are all the values for which the x-axis is less than the line x=4 (all the values to the left of the line).
Observe the graphs attached.
Answer:
20 % 40% 60% 80% 90% is the numbers you're missing.
Step-by-step explanation:
10 ,<u>20,</u> 30, <u><em>40</em></u>, 50, <u>60</u>, 70, <u>80</u>, <u>90</u>, 100. The numbers underlined is what you're missing and their in order. 10-100.