OpenStudy (anonymous):

please help express in interval notation x≥7 a. (-oo,7) b. [7,oo) c. (-oo,7] d. (7,oo)

4 years ago
OpenStudy (goformit100):

"oo" Means ?

4 years ago
OpenStudy (ivettef365):

that means x is greater or equal to 7, so it could be 7 to infinity

4 years ago
OpenStudy (anonymous):

i don't understand this

4 years ago
OpenStudy (anonymous):

"oo" is infinity. If you have an equal with your > or <, you want to use a "[" If you don't have an equal with your > or <, you want to use a "("

4 years ago
OpenStudy (anonymous):

Let's draw the area represented by x>=7 on a number line|dw:1377013094931:dw|

4 years ago
OpenStudy (anonymous):

Your left boundary is 7...and there's an equal...so use "[" on the left Your right boundary is infinity. Always use a ) or ( with infinity...never a [ or ]

4 years ago
OpenStudy (anonymous):

okay i think i understand it now

4 years ago