Answer:

Step-by-step explanation:
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The 90th percentile is 1.2816 standard deviations from the mean. That tells you the standard deviation is ...
... (40 in - 38 in)/(1.2816) ≈ 1.56 in
The standard deviation for height for 4-year olds seems to be 1.56 inches.
Answer:
At the midpoint of the hypotenuse
Step-by-step explanation:
The circumcentre is the point of intersection of the 3 perpendicular bisectors.
It is positioned.
Inside all Acute triangles.
Outside all Obtuse triangles.
At the midpoint of the hypotenuse on all Right triangles.
The answer is (2,-6) look at the picture to see how to do it
No, JN is not paralle to KM