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Mathematics 18 Online
OpenStudy (anonymous):

NEED HELP AND WILL FAN/MEDAL Solve for x: 5 − (x + 5) > −2(x + 4) (1 point) x > −8 x > −18 x < −18 x < −8

OpenStudy (gibbs):

x > −8

OpenStudy (anonymous):

can you show me the steps please

OpenStudy (gibbs):

1. Simplify brackets 5−x−5>−2(x+4) 2. Simplify 5−x−5 to −x −x>−2(x+4) 3. Expand −x>−2x−8 4. Add 2x to both sides −x+2x>−8 5. Simplify −x+2x to x x>−8

OpenStudy (anonymous):

ok thank you

OpenStudy (anonymous):

Marcie solved the following inequality, and her work is shown below: −2(x − 5) − 12 ≤ 4 + 6(x + 3) −2x + 10 − 12 ≤ 4 + 6x + 18 −2x − 2 ≤ 6x + 22 −8x ≤ 24 x ≤ −3 What mistake did Marcie make in solving the inequality?

OpenStudy (anonymous):

@YK.PAPI can u help?

OpenStudy (anonymous):

@Zbratz7 can u help?

OpenStudy (anonymous):

sure ill try

OpenStudy (anonymous):

ok thanks

OpenStudy (anonymous):

wait i think ive got it

OpenStudy (anonymous):

Distribute so you can eliminate the () \[Distribute so you can eliminate the () -2x+10-12\le4+6x+18\] combine like terms and simplify

OpenStudy (anonymous):

since the last line is a negative you multiply, but she divided

OpenStudy (anonymous):

What mistake did Marcie make in solving the inequality? She subtracted 6x from both sides when she should have added 2x. She added 2 to both sides when she should have subtracted 22. When dividing by −8, she did not change the ≤ to ≥. She did not make a mistake

OpenStudy (anonymous):

If you multiply or divide by a negative number when solving an inequality, you must reverse the sign. This example the last step did not flip the sign. it should have said x≥−3

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