Mathematics
8 Online
OpenStudy (anonymous):
Solve:
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OpenStudy (anonymous):
Solve what?
OpenStudy (anonymous):
\[-10\le-4x-18\le30\]
a. \[-12\le x \le -2\]
b. \[2\le x \le 12\]
c. \[-2 \le x OR x \le-12\]
d. \[12<x <-2\]
OpenStudy (anonymous):
Its A.
OpenStudy (igreen):
\(-10\le-4x-18\le30\)
Add 18 to all terms.
What's -10 + 18?
And what's 30 + 18?
@pigglet
OpenStudy (anonymous):
48 @iGreen
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OpenStudy (igreen):
@juliephillips Don't give out answers.
Read the Code of Conduct. https:/www.openstudy.com/code-of-conduct
OpenStudy (anonymous):
Oh sorry. @iGreen Congrats on the 99...
OpenStudy (igreen):
Yes, 30 + 18 = 48, what about -10 + 18?
OpenStudy (igreen):
Thanks @juliephillips In fact, I just got it yesterday..xD
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OpenStudy (anonymous):
I saw. In OS feedback..
OpenStudy (anonymous):
8 @iGreen
OpenStudy (anonymous):
yes......
OpenStudy (igreen):
Yep, that gives us:
\(8 \le -4x \le 48\)
Now divide -4 to all terms.
8 / -4 = ?
48 / -4 = ? @pigglet
OpenStudy (igreen):
Oh cool. @juliephillips
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OpenStudy (anonymous):
8/-4=-2 ?
48/-4=-12?
@iGreen
OpenStudy (anonymous):
YES
OpenStudy (igreen):
Yep, so that gives us:
\(-2 \ge x \ge -12\)
or
\(-12 \le x \le -2\)
OpenStudy (anonymous):
so, its a. Thanks!
OpenStudy (igreen):
Remember to switch both signs 'cause you divided by negative numbers.