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hihi67

  • 4 years ago

i have some algebra equations that i have done. can you check them? (i will post them soon).

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  1. hihi67
    • 4 years ago
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    a) k/3 + k/2 =

  2. hihi67
    • 4 years ago
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    b) 4/5 x - 1/10 x

  3. hihi67
    • 4 years ago
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    c) 3/8 z - 1/4 z + 1/2 z

  4. hihi67
    • 4 years ago
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    d) s/5 - s/3 + s

  5. hihi67
    • 4 years ago
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    e) 1 1/2 m - 3/4m + m/8

  6. hihi67
    • 4 years ago
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    and.....

  7. hihi67
    • 4 years ago
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    f) -4a/5 + 1/10a - 3a

  8. hihi67
    • 4 years ago
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    tell me what answers you get, and then i will see if i have the same. pleasee....?

  9. agreene
    • 4 years ago
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    a) \[\frac{5k}6\] b) \[\frac7{10x}\] c) \[\frac5{8z}\] d) \[\frac{13s}{15}\] e) \[\frac{m}{8}-\frac{1}{4m}\] f) \[\frac1{10a}-\frac{19a}5\]

  10. hihi67
    • 4 years ago
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    okay... well for a b and c i have the same. for d i have - 17/15s. for e i have 6/8m. for f i have - 3 and 9/10a

  11. hihi67
    • 4 years ago
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    this is how i figured it out. d:

  12. agreene
    • 4 years ago
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    from d down it was a bit hard to know what the question was--since you didn't use parenthesis.

  13. hihi67
    • 4 years ago
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    no () in book either.

  14. hihi67
    • 4 years ago
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    ust a min.

  15. agreene
    • 4 years ago
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    d could have been: \[\frac{s}5 - \frac{s}3 + s\] which is what i assumed, or \[\frac{s}5-\frac{s}{3+s}\] which would be a harder problem, lol

  16. hihi67
    • 4 years ago
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    \[s/5 - s/3 + s : \space \space \space \space \space \space \space \space \space s-5-s/3 = 3s/15 - 5s/15 \space \space \space that equals -2s/15 \space \space \space \space \space -2s/15 + s = \]

  17. hihi67
    • 4 years ago
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    thats d

  18. hihi67
    • 4 years ago
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    dang cant see it.

  19. hihi67
    • 4 years ago
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    never mind...

  20. hihi67
    • 4 years ago
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    bye thanks

  21. agreene
    • 4 years ago
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    lol dont give up so quickly :P

  22. hihi67
    • 4 years ago
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    ooooh I KNOW!

  23. hihi67
    • 4 years ago
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    stupid "order of operations"

  24. hihi67
    • 4 years ago
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    yep, thanks! you really actually did help a lot!!!

  25. agreene
    • 4 years ago
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    for d: I find it easier to start by factoring out the variables (makes it easier for me to see): s/5 - s/3 +s \[\frac15(s) - \frac13(s)+ s\] combine your fractions: \[-\frac2{15}(s)+s\] combine those fractions (convert the +s to +15s/15 so its the same denominator) \[\frac{15}{15}(s) - \frac2{15}(s) = \frac{15-2}{15}(s)==\frac{13}{15}(s)\] or \[\frac{13s}{15}\] thats how I like to work these, of course--if your way is easier for you and works, do that!

  26. hihi67
    • 4 years ago
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    you are very much a genius. that really helps!!!! you should become my math teacher!

  27. hihi67
    • 4 years ago
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    hah

  28. hihi67
    • 4 years ago
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    what about for e?

  29. hihi67
    • 4 years ago
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    e is 7/8m

  30. hihi67
    • 4 years ago
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    because: 1 1/2m is 3/2m and 3/4 m, normal. m/8 = 1/8 times m. 3/2 time m - 3/4 times m is 3/4 times m. 3/4 time m - 1/8 times m is 7/8

  31. agreene
    • 4 years ago
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    Its a little bit harder, but: I'd start by converting that mixed fraction in the front, 1 1/2 = 3/2 so 1 1/(2m) = 3/(2m) that gives us: \[\frac3{2m}-\frac3{4m}+\frac{m}8\] convert that 2m denominator to 4m by multiplying 2/2 through it: \[\frac6{4m}-\frac3{4m}+\frac{m}8\] 6-3 = 3 so: \[\frac3{4m}+\frac{m}8\] although you can simplify this a bit, id leave it there and call that my answer.

  32. hihi67
    • 4 years ago
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    okay..

  33. hihi67
    • 4 years ago
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    what i dont get, is f) how is -4a/5 + 1/10 a is -7/10a. its -9/10a!!!

  34. hihi67
    • 4 years ago
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    i solved it right, but for some reason i keep getting -9/10.

  35. hihi67
    • 4 years ago
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    which is sad, cause i should know how to solve that.

  36. agreene
    • 4 years ago
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    combining \[\frac{-4a}5+\frac1{10a}\] is a bit tricky, in fact in my first answer, i didn't even do it. the reason is the variable is in the numerator of one and the denominator of the other... if you would like to do it, remember you need to multiply through and get the same denominator... in this case: 10a is what we need. 5 is what we have, so we need to multiply through 2a to the fraction on the left: \[\frac{-4a}{5}*\frac{2a}{2a}+\frac1{10a}\] \[\frac{-8a^2}{10a}+\frac1{10a}\] now we can combine these two, since they have the same denominator: \[\frac{1-8a^2}{10a}\]

  37. hihi67
    • 4 years ago
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    oh. i just did 5 * 2 is 10. -4a * 2 is 8!

  38. agreene
    • 4 years ago
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    yeah this one is a bit more tricky :P

  39. hihi67
    • 4 years ago
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    okay. thank!

  40. hihi67
    • 4 years ago
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    you

  41. hihi67
    • 4 years ago
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    bye now!

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