
The area of the square can be expressed as

So to go back to the side length, you just need to find the square root of the area.
I tnjnk is b I'm not sure
Answer:
Option A 
Step-by-step explanation:
we know that
The perimeter of the rectangle is equal to

we have

-----> equation A
substitute the value of L in the equation A
Find the perimeter

You multiply $150 times 23%
or .23
this equals 34.5 which is the amount you will be taking off (the discount)
so then you subtract 150-34.5 which equals $115.50
Answer:
At least 832 teenargers must be interviewed.
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so
Now, find the margin of error M as such
In which
is the standard deviation of the population and n is the size of the sample.
How many teenagers must the firm interview in order to have a margin of error of at most 0.1 liter when constructing a 99% confidence interval
At least n teenargers must be interviewed.
n is found when M = 0.1.
We have that 
So




Rounding up
At least 832 teenargers must be interviewed.