ANYONE GOOD AT ALGEBRA? please help :)

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  • The_Enginerd
    The_Enginerd Posts: 3,982 Member
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    I'm good at math, but I prefer to give lessons in biology as payment beforehand.
  • Warchortle
    Warchortle Posts: 2,197 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.

    I think it may be more complicated on that, depending on how the problem is supposed to read. OP originally posted

    s=(r((6+i)^n-6))/i

    followed by

    s=r(6+i)^n-6) then that all over "i" as a fraction

    In the second version, there is one too many ")". In the first, if accurate, the entire ((6+i)^n-6) would be multiplied by "r", preventing you from simply adding 6 to both sides of the equation.

    If I'm incorrect, please let me know. I'm blonde and it's still early.

    ETA: If it IS supposed to be written the way you interpretted it, I agree with your math completely.
    I rather do it the easy way if you understand the problem I see... just multiply by i then exchange r and s... you don't need to go through a whole bunch of other processes if R is on the outside and you can just multiply by the reciprocals.
  • EddieHaskell97
    EddieHaskell97 Posts: 2,227 Member
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    The first answer is beautifully precise and explained quite well. My compliments to the prof.
  • ldrosophila
    ldrosophila Posts: 7,512 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.

    I think it may be more complicated on that, depending on how the problem is supposed to read. OP originally posted

    s=(r((6+i)^n-6))/i

    followed by

    s=r(6+i)^n-6) then that all over "i" as a fraction

    In the second version, there is one too many ")". In the first, if accurate, the entire ((6+i)^n-6) would be multiplied by "r", preventing you from simply adding 6 to both sides of the equation.

    If I'm incorrect, please let me know. I'm blonde and it's still early.

    ETA: If it IS supposed to be written the way you interpretted it, I agree with your math completely.

    That's what got me stuck because I kept trying to multiply the R, and started to FOIL the 6+i till I realized the exponent was N!
  • Angie80281
    Angie80281 Posts: 444 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.

    I think it may be more complicated on that, depending on how the problem is supposed to read. OP originally posted

    s=(r((6+i)^n-6))/i

    followed by

    s=r(6+i)^n-6) then that all over "i" as a fraction

    In the second version, there is one too many ")". In the first, if accurate, the entire ((6+i)^n-6) would be multiplied by "r", preventing you from simply adding 6 to both sides of the equation.

    If I'm incorrect, please let me know. I'm blonde and it's still early.

    ETA: If it IS supposed to be written the way you interpretted it, I agree with your math completely.

    That's what got me stuck because I kept trying to multiply the R, and started to FOIL the 6+i till I realized the exponent was N!

    I did the same thing at first. If the way she wrote it is correct, it should be r = (si)/((6+i)^n -6)
  • gzus7freek
    gzus7freek Posts: 494 Member
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    R = Pie?

    2R7CAJ0K598THG5MO1OJ7MZCIV4JZ.png
  • linsey0689
    linsey0689 Posts: 753 Member
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    si=r(6+i)^n -6
    si+6 = r(6+i)^n
    (si+6)/((6+i)^n) = r

    Since there is only one r, you need to separate all the other stuff from around the r, paying attention to order of operations to keep the right things together.

    First multiply both sides by i, cancelling out the i on the right side. Then add 6 to both sides, cancelling out the 6 on the right side. Then multiply by 1/(6+i)^n on both sides, cancelling it out on the right side and leaving only r.

    thank you!
  • AliciaStinger
    AliciaStinger Posts: 402 Member
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    Apparently I'm not. I tried to solve the problem to see if I'm even qualified to give you instructions.............NOPE. Good luck.
  • CookNLift
    CookNLift Posts: 3,660 Member
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    http://www.wolframalpha.com/input/?i=s=(r((6+i)^n-6))/i+solve+for+r
  • linsey0689
    linsey0689 Posts: 753 Member
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    i would like to thank everyone who tried and help me very nice of you. i knew i would get some negative comments but that's okay i understand that's not what this site is made for but almost everyone on here is so nice that's why i decided to ask.


    thanks again everyone :)
  • gsnobel
    gsnobel Posts: 49 Member
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    Answer is correct BUT How much Wood could a woodchuck chuck?

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