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anonymous

  • 5 years ago

(2/7)r + 2r = (1/2)r + (17/2) Solve for r.

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  1. anonymous
    • 5 years ago
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    I'm not really sure where to start :(

  2. anonymous
    • 5 years ago
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    ok, ill help,

  3. anonymous
    • 5 years ago
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    future warning, i might suddenly leave, but thats because my cp froze. sorry!

  4. Oaktree
    • 5 years ago
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    I'll help then.

  5. anonymous
    • 5 years ago
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    That's okay :) I apprciate the help

  6. anonymous
    • 5 years ago
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    ok, oaktree, go right ahead.

  7. Oaktree
    • 5 years ago
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    So, first you want to multiply each term by 2 to get rid of the fractions.

  8. Oaktree
    • 5 years ago
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    You get 4/7r+4r=r+17

  9. Oaktree
    • 5 years ago
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    Then multiply each term by 7 to get rid of the other fraction

  10. anonymous
    • 5 years ago
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    Oh! I see it's about getting rid of the fractions?

  11. Oaktree
    • 5 years ago
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    And you get 4r+28r=7r+119

  12. Oaktree
    • 5 years ago
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    No, it just makes it easier to solve.

  13. anonymous
    • 5 years ago
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    not exactly, but its helpful to simplify the, your goal is to isolate the r

  14. anonymous
    • 5 years ago
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    to simplify them*

  15. Oaktree
    • 5 years ago
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    So then you can simplify and get 25r=119

  16. anonymous
    • 5 years ago
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    Oh! That makes sense. My professor kept telling me to multiply everything by 14

  17. Oaktree
    • 5 years ago
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    That also works because it is really doing both at once, but it's simpler to do them in two steps to prevent mistakes.

  18. Oaktree
    • 5 years ago
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    From 25r=119, you can easily get r=119/25.

  19. anonymous
    • 5 years ago
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    That's where I got confused! Thank you both sooo much!

  20. Oaktree
    • 5 years ago
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    Which I don't believe can be simplified.

  21. Oaktree
    • 5 years ago
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    So that's your final answer.

  22. Oaktree
    • 5 years ago
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    You're welcome!

  23. Oaktree
    • 5 years ago
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    Anything else I missed, mathfreak?

  24. Oaktree
    • 5 years ago
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    You O.K. there?

  25. anonymous
    • 5 years ago
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    oaktree, is that right? mustn't you multiply it to the other side as well( simple an important rule, you can do something to one side of the equation, as long as you do the same to the other side.)

  26. Oaktree
    • 5 years ago
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    What do you mean?

  27. Oaktree
    • 5 years ago
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    Multiply what?

  28. Oaktree
    • 5 years ago
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    If you mean the 2 and the 7, I did multiply both sides. Check my equation, maybe I messed it up somewhere.

  29. anonymous
    • 5 years ago
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    ya, i noticed that. did you inform her about it?

  30. anonymous
    • 5 years ago
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    sorry, this site crashes my cp,

  31. anonymous
    • 5 years ago
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    Yeah I saw it.

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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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