Question

Help+Medal!
Which of the following is an irrational number?
A. √169
B. 0.78
C. (√12)²
D. √18

Answer 1

\[0.\overline{78} = \dfrac{78}{99}\]

so thats NOT irrational

Answer 2

an irrational number is simply anything that cant be represented as a fraction

Answer 3

So 0.78 is irrational?

Answer 4

@Awolflover1

Answer 5

@Presh08

Answer 6

@acxbox22

Answer 7

do you get it

Answer 8

you can put
___
0.78 as a fraction

Answer 9

no what is the square root of 169?

Answer 10

now*

Answer 11

answer is 13. sorry openstudy slow

Answer 12

@acxbox22

Answer 13

yes what is \[\left( \sqrt{12} \right)^2\] ?

Answer 14

12

Answer 15

correct
78/99, 13, and 12 can be represented as fractions so this leaves sqrt18 which cant be represented as a fraction
therefore sqrt18 is irrational

Answer 16

Ooh. Ok I get it Thx :)