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What group of real numbers does Pi belong to?
Pi is an Irrational number, which is one of the two subcategories of real numbers.
Which group of sets does the number -15 belong to?
To any set that contains it! It belongs to {-15}, or {sqrt(2), -15, pi, -3/7}, or all whole numbers between -43 and 53, or multiples of 5, or composite numbers, or integers, or rational numbers, or real numbers, or complex numbers, etc.
Which subsets of real numbers does the number -22 belong?
To any set that contains it! It belongs to {-22}, or {-22, sqrt(2), pi, -3/7}, or all whole numbers between -43 and 53, or multiples of 11, or composite numbers, or integers, or rational numbers, or real numbers, etc.
Can you subtract two irrational numbers to get a rational number?
Yes. For example: pi - pi = 0
What set of numbers does pi belong to?
Real, complex, quaternion, etc. But more specifically it's a transcendental real number, not being the root of an integer polynomial (and certainly not the ratio of two integers).
