OpenStudy (anonymous):

What is the solution set of {x | x < -5} ∩ {x | x > 5}? all numbers less than -5 and greater than 5 the numbers between -5 and 5 the empty set all real numbers

OpenStudy (kainui):

OpenStudy (anonymous):

Phi

OpenStudy (anonymous):

the first choice

OpenStudy (agent0smith):

x < -5 so you know what that and this means x > 5 right? Do you know what the ∩ means?

OpenStudy (anonymous):

Phi

OpenStudy (agent0smith):

The ∩ symbol is the key here... it means and. You decided on this right? "all numbers less than -5 and greater than 5" Tell me one number that is less than -5 AND greater than 5.

OpenStudy (anonymous):

yeah I think its the first one but not sure, I am not good with these

OpenStudy (agent0smith):

Reread my above post. Especially the last line.

OpenStudy (anonymous):

@Tiffany6500 i'll give you a hint: Phi

OpenStudy (ganeshie8):

tell me some person whose height is less than 5 feet AND more than 6 feet

OpenStudy (ganeshie8):

thats same as the agent's question... the point is this :- u cannot say something is blue and green at the same time. a thing is blue, or green. it cannot be both blue and green at the same time.

OpenStudy (ganeshie8):

 Tell me one number that is less than -5 AND greater than 5.  a number is less than -5 or greater than 5 or equal to 5 it cannot be all 3 at the same time.

OpenStudy (anonymous):

ok

OpenStudy (ganeshie8):

so what can we conclude ? :)

OpenStudy (ganeshie8):

u need to see it for urself, explaining it more wud oly complicate things hmm

OpenStudy (anonymous):

empty set?

OpenStudy (agent0smith):

Try to tell us a number that is less than -5 AND greater than 5.

OpenStudy (agent0smith):

@Kainui I don't get why you were saying phi. The symbol isn't a phi, and doesn't really look that much like one (maybe if you rotated it)

OpenStudy (kainui):

@agent0smith I never said anything about phi.

OpenStudy (anonymous):

thanks for the help