Answer:
<h2>The total surface area of the figure is 516 square units.</h2>
Step-by-step explanation:
The net of the triangular prims is attached.
Remember, the total surface area refers to the area of each face of the volumetric figure. In this case we have three equal rectangles and two equal triangles.
<h3>Area of the rectangles.</h3>
Remember that the area of a rectangle is just the product of its width and height.
<h3>Area of the triangles.</h3>
The total surface area is given by the sum of all these areas:
Therefore, the total surface area of the figure is 516 square units.
The square root of 400 can be positive 20 or negative 20. 20x20=400. -20x-20=400. Hope this helps! ;)
Answer:
3
Step-by-step explanation:
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Answer:
The minimum sample size needed is 125.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
For this problem, we have that:
99% confidence level
So , z is the value of Z that has a pvalue of , so .
What minimum sample size would be necessary in order ensure a margin of error of 10 percentage points (or less) if they use the prior estimate that 25 percent of the pick-axes are in need of repair?
This minimum sample size is n.
n is found when
So
Rounding up
The minimum sample size needed is 125.