Question

Which Number is irrational?

Answer 1

hint:
81 is a perfect square, whereas 51 is not a perfect square

Answer 2

furthermore:
\[3.8 = \frac{{38}}{{10}} = \frac{{19}}{5}\]

Answer 3

So the answer would be C?

Answer 4

no, since 3.8, is a rational number

Answer 5

an irrational number is a number which is non periodic, and it has infinite decimals

Answer 6

oh i get it \[\sqrt{81}\]
that is the answer

Answer 7

no, since \[\sqrt {81} = 9\]
namely it has not infinite decimals

Answer 8

what is:
\[\sqrt {51} = ...?\]

Answer 9

use your calculator

Answer 10

hint:
how many decimal figures has \[\sqrt {51} \]?

Answer 11

Ya, OK figured it out the answer is \[\sqrt{51}\]

Answer 12

that's right!

Answer 13

So your a qualified helper?

Answer 14

yes!

Answer 15

cool

Answer 16

thanks! :)

Answer 17

will you fan me back?

Answer 18

ok!