Question

Which of the following is a rational number?
square root 15 square root 16, square root 21, square root 22
square root 15
square root 16
square root 21
square root 22

Answer 1

hint:
\[\Large 16 = {4^2}\]
whereas 15, 21, and 22 are not perfect squares

Answer 2

so we can write:
\[\Large \sqrt {16} = 4 = \frac{4}{1}\]

Answer 3

for example we can not find a pair of positive integer, say m and n, such that
\[\Large \sqrt {21} = \frac{m}{n}\]
with n different from zero

Answer 4

integers*

Answer 5

sorry

Answer 6

no worries! :)
what is the right option?

Answer 7

so the answer is 16

Answer 8

better is square root of 16

Answer 9

yes square root 16 is the right answer (:

Answer 10

correct!

Answer 11

i knew it was the right answer cause thats what i had

Answer 12

ok!