https://gyazo.com/47e244b6634e7c1af2940501c21b6c17

Question

mathmale · Answer

First off, jamal, what is an "irrational number?"  Have to know what you're looking for.
If you have a calculator on hand, try finding the square root of all of the possible answers.  What do you notice?

jamaljunior · Answer

how to get square root @mathmale

mathmale · Answer

Have a calculator?

jamaljunior · Answer

yes

mathmale · Answer

Try Sqrt(9).  Then try Sqrt(99).

Your calculator should have a Sqrt(   key.

mathmale · Answer

Sqrt(9)=?

Sqrt(99)=?

jamaljunior · Answer

it doesnt

mathmale · Answer

doesn't have a square root key?

mathmale · Answer

What kind of calc. do you have?

jamaljunior · Answer

my iphone

mathmale · Answer

Don't look for the word "Sqrt."  Instad, look for the symbol$$\sqrt{x}$$

jamaljunior · Answer

i see that but it was a yx−−√

jamaljunior · Answer

oh man

mathmale · Answer

I'd bet your phone does have the square root function built in, but I'm not familiar with that phone.

jamaljunior · Answer

it was a y on it

jamaljunior · Answer

i can use googles calc.

mathmale · Answer

|dw:1477364396009:dw|

mathmale · Answer

Yes. Type in Sqrt(9), then Sqrt(99).

jamaljunior · Answer

3 and 9.94

mathmale · Answer

Right.  3 can be written as 3/1, the ratio of two integers.  That's a rational number.
9.94................, on the other hand, cannot be written as the ratio of two integers, and thus is irrational.

Note that 99 = 9 * 11.  9 is rational, 11 is rational, but Sqrt(11) is irrational.

You have 5 answers to choose from.  Try all of them on your Google calculator.

Which ones are rational and which are not?

jamaljunior · Answer

where did you get 3 and 9 from??

jamaljunior · Answer

@mathmale

mathmale · Answer

I need for you to find the square root of all 5 of the given numbers:  10, 27, 49, 64 and 99.

We've already discussed 99 and the square root of 99.
The square root of 99 is irrational because the square root of the factor, 11, is irrational.

List all 5 square roots and your values for them.

$$\sqrt{10}=?$$

mathmale · Answer

finish that and then do the remaining four.  Which ones appear to be rational and which ones do not?

mathmale · Answer

Please let me know in advance if you're going to log off OpenStudy in the middle of a discussion.  I'm helping you voluntarily and would appreciate knowing that you appreciate my help enough to be courteous.