Answer:
A sample of 179 is needed.
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 
.
That is z with a pvalue of 
, so Z = 1.44.
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.
A previous study found that for an average family the variance is 1.69 gallon?
This means that 
If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?
A sample of n is needed, and n is found for M = 0.14. So
Rounding up
A sample of 179 is needed.
I think your answer would be 14 if this is what it’s asking for
Because 6/6 makes 1 so 13+1 is 14
Both have the same denominator
Remove the denominator
5=n
The area of the hexagon 24a² -18 is equivalent to 6(4a² -3).
Option A is the correct answer.
<h3>What is a Hexagon ?</h3>
A polygon with 6 sides is called a Hexagon.
The area of a hexagon is equal to area of 6 equilateral triangles.
The area of hexagon is given as
24a² -18
6(4a² -3)
Therefore the area of the hexagon 24a² -18 is equivalent to 6(4a² -3).
Option A is the correct answer.
To know more about Hexagon
brainly.com/question/3295271
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