Question

i need help :( i will medal and fan

http://uploadpie.com/rxx5R <---- the problem

Answer 1

your thoughts?

Answer 2

A rational number is a number that can be written as a ratio. That means it can be written as a fraction, in which both the numerator (the number on top) and the denominator (the number on the bottom) are whole numbers. The number 8 is a rational number because it can be written as the fraction 8/1.

Answer 3

mines are a b b a

Answer 4

irrational number in Technology Expand. mathematics. A real number which is not a rational number, i.e. it is not the ratio of two integers. The decimal expansion of an irrational is infinite but does not end in an infinite repeating sequence of digits.

Answer 5

so... am i right?

Answer 6

waaaait now im thinking its aaab

Answer 7

I have to go sorry hope the explanations help

Answer 8

@Here_to_Help15

Answer 9

@SolomonZelman

Answer 10

@rational

Answer 11

@mathmate

Answer 12

@Majesty69

Answer 13

@Michele_Laino

Answer 14

@dan815
@perl
@Preetha

Answer 15

@Megan30400

Answer 16

@meme106

Answer 17

Have you finished reading what @Mahmood786123 wrote?
@linastar13

Answer 18

yea but im still confused

Answer 19

Where are you confused?

Answer 20

I mean which part?

Answer 21

um well not nececerly confused just im not sure my answers are rigt :(

Answer 22

*right

Answer 23

What's important is whether you understand, the answers will then come automatically.
This question is what I call the "definition" question. All you need to know to answer is
- what is a rational number, and
- what is an irrational number.
Did you get that from what @Mahmood786123 wrote?

Answer 24

yea

Answer 25

So is \(\sqrt 7\) a rational number?

Answer 26

no

Answer 27

How about 16.25

Answer 28

yea

Answer 29

good! How about \(\pi\)?

Answer 30

nope :)

Answer 31

Why?

Answer 32

cause ...well um to tell the truth i dont know y but i read it on my math book that the nomber 3.14 is irational

Answer 33

Yes, I like your answer, it tells me where to go.
ok, \(\pi=3.141592653589793238462643383279502884197169399375....\)
The decimal part continues, and never repeats. So we cannot represent it by a fraction, so it is irrational.

Answer 34

Now is \(\sqrt{84}\) rational?

Answer 35

no

Answer 36

note that \(\sqrt{84}=\sqrt{4*21}=2\sqrt{21}\) but we cannot simplify further.

Answer 37

Correct, \(\sqrt{84}\) is irrational.
How about \(\sqrt{81}\) ?

Answer 38

irrational?

Answer 39

Can you explain why, after you have tried to simplify it as much as you can.
(see example above)

Answer 40

um....ehhh well idk :( lol im not that smart

Answer 41

Math is hard work, and does not depend on smartness. Unfortunately those who \(depend\) on smartness will soon drop out if they don't work hard.

Answer 42

:D lol yaass i know :( but i try and 30% of the time i get it wrong

Answer 43

I'll give you an example:
\(\sqrt{16}\) = \(\sqrt{(4^2}\) = \(\sqrt{4})^2\) = 4
Study it carefully to make sure you understand how it works.
If it's not clear, let me know.

Answer 44

I messed it up, it should read:
\(\sqrt{16}\)= \(\sqrt{4^2}\) = \((\sqrt{4})^2\) = 4

Answer 45

kk so i got 81= 9*9= 4?

Answer 46

first part is ok,
81=9*9=9^2
so sqrt(81)=9
(does not equal 4)
So is sqrt(81) a rational number?
(ask yourself "can I express 4 as a fraction?" )

Answer 47

no?

Answer 48

(ask yourself "can I express 9 as a fraction?" )
The answer is yes, because 9=9/1=18/2=27/3.... in multiple ways!

Answer 49

So is sqrt(81) rational or is it irrational ?
(remember to use the definition of ration numbers, as explained earlier)

Answer 50

ooooh ok :)

Answer 51

its rational?

Answer 52

Correct, but why?

Answer 53

because you can express your answer

Answer 54

... can you complete you sentence please?

Answer 55

that is my sentence lol!!!!

Answer 56

because you can express the number in terms of a fraction (for rational numbers)

I think you're getting there.
Try to figure out the 3rd and 4th one, and tag me when you get your answer (complete with explanations).

Answer 57

i got b and a for the next two ones @mathmate

Answer 58

Explain, please

Answer 59

well for the first one i got b as irrational cause i cant ration any nombers with 128

Answer 60

and for the second one 400=10*40 ? is that correct?

Answer 61

@mathmate

Answer 62

10*40 is not. but 400=20^2, so sqrt(400)=20 and it is rational.
b and a are correct then!

Answer 63

yea!!! :) tanks buddy