Cotangent of ∠l = adjacent side / opposite side
cotangent of ∠l = - 15/8
Correct option D
Informally assess the degree of visual overlap of two numerical data distributions with similar variabilities, measuring the difference between the centers by expressing it as a multiple of a measure of variability.
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ANSWER
My answer is in the photo above
For a number to be rational by definition, a fractional representation of the number must exist.
So N = n/m is rational if n and m are integers.
Since it's given in fractional form it's rational by definition.
Hence false.