Answer:
11.9 mm
Step-by-step explanation:
We can find d by applying the cosine rules.
d² = 21² + 27² - 2(21)(27) cos (25)
d² = 441 + 729 - 1027.75
d² = 142.25
d = √142.25
d = 11.9 mm (nearest tenth)
The mean of this test will be 57.
<h3>What is Standard Deviation and Mean?</h3>
A standard deviation (or σ) is a measure of how dispersed the data is in relation to the mean.
The mean can be used to get an overall idea, or picture, of the data set.
Let Mean be 'm'
and standard deviation= 
So, m-2
=49
and, m +
=61
Solving the above two equation we get

Now, m= 61-
= 61-4
= 57
So , the mean of this test will be =57
Learn more about mean and standard deviation here:
brainly.com/question/16030790
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Answer:
irrational
Step-by-step explanation:
when you multiply a irrational number by a rational number you dont lose the properties of an irrational number
The solution is 12. The problem tells you that when is between 9-13. Then 12 is the answer
Circumference formula: 2πr
2 multiply the π by the radius which will be 4.5 because to get the radius u will have to to do 9 divide 2 which will be 4.5.
Calculate that in the calculator and you’ll get:
C=28.3 ( I rounded to the nearest tenth)