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Mathematics 20 Online
OpenStudy (anonymous):

Write a compound inequality to represent all of the numbers between -4 and 6.

OpenStudy (phi):

how do you write x is bigger than -4 ?

OpenStudy (anonymous):

i dont know. im awful at anything that has to do with algebra.

OpenStudy (phi):

do you know about < and > signs ?

OpenStudy (anonymous):

sort of. it would be x<4?

OpenStudy (phi):

the skinny pointy side of < points at the smaller number, and the fat end points at the bigger number. Example: 1 < 2 says "one is less than 2" now how do you write -4 is less than x ?

OpenStudy (anonymous):

OH. so x > -4...?

OpenStudy (anonymous):

would it be -4< x < 6 ?

OpenStudy (phi):

yes, x > -4 says x is bigger than -4 notice you can also write it a different way -4 < x which means the same thing. now how do you write x is less than 6 ?

OpenStudy (anonymous):

x<6

OpenStudy (phi):

now combine the statements (people do this because they like to shorten things up)

OpenStudy (anonymous):

-4< x < 6

OpenStudy (phi):

yes. all of the numbers between -4 and 6. means all the numbers bigger than -4 (written x> -4 or -4 < x) and less than 6 (written x < 6 or 6 > x) if you write the numbers small to large -4 x 6 then put in the correct sign you get -4 < x < 6

OpenStudy (anonymous):

Ohh, alright. Thank you. ^^

OpenStudy (phi):

you could write it 6 > x > -4 but most people think "small to big" is more natural.

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