Question

Which of these numbers can be classified as both real and rational?

A. 5.858585858558
B. 63.4
C. The square root of 21
D. The square root of 36

Answer 1

A, B, and D are all rationa numbers, as they can all be expressed as a fraction, where numerastor and denominator are integers (where denominator is not 0).

Answer 2

Which ones the real number too?

Answer 3

They are ALL real. Three of them are real and rational. One of them is real and irrational.

Answer 4

if they are rational numbers, obvious they are as real number too.
(rational number is part of real number)

Answer 5

OH which one is real and irrational?

Answer 6

sqrt(21) is real and irrational

Answer 7

C. The square root of 21. 21 is not a perfect square and so its square root is irrational.