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Arithmetic sequence homework

  1. Nov 4, 2009 #1
    a few questions ....

    25. Write an equation to show how the amount of money in a jar of nickels is related to the number of nickels in the jar. If the jar contains 40 nickels, how much money is this?

    (Hint: Define the variables that are used in your equation. Use your equation to to determine how much money is in a jar containing 40 nickels.)

    27. Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule.

    A (n) + -3 (n-1)(-2.2)

    28. Find the first, fourth, and eighth terms of the sequence.
    a(n)=-2X2*-1

    29. Evaluate the formula
    V-Bh/3 when B=9 inchsquarred and H=32 in ... show your work please

    30. Simplify the expression.13[62 ÷ (52 – 42) + 9]
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 4, 2009 #2

    berkeman

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    Staff: Mentor

    Re: a few questions ....

    We do not do your homework for you. You must show your work and efforts at solving the problems, before we can offer any tutorial help.
     
  4. Nov 4, 2009 #3
    Re: a few questions ....

    well i just figured out 29 and 30 but i dont know how to do the two terms one i dont know the set up or how to do it even if you just would show me wiht a different set of numbers. i also dont under what they ask for 25 its not that i was just the answers its the process i dont know ugh!
     
  5. Nov 4, 2009 #4
    Re: a few questions ....

    You're questions are written out very poorly and hard to understand.

    What is a nickel in terms of money?

    For the questions on sequences, try plugging in the required numbers into the formula and see what you get. It is not a difficult process but if you are unsure of your answers, post one of your answers as well as your reasoning for someone to verify them.
     
  6. Nov 4, 2009 #5
    Re: a few questions ....

    okay i tried number 27 out so here it is
    27. Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule.

    A (n) + -3 (n-1)(-2.2)


    1st term
    A(1) + -3 (1-1)(-2.2)
    -3 (0) (-2.2)
    -3(-2.2)
    6.6
    4th Term
    A(4) +-3 (4-1)(-2.2)
    -3(3)(-2.2)
    -3(-6.6)
    19.8

    10th term
    A(10)+ -3 (10-1)(-2.2)
    -3(9)(-2.2)
    -3(-19.8)
    59.4

    is this anywhere close to what is needed?
     
  7. Nov 4, 2009 #6

    berkeman

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    Staff: Mentor

    Re: a few questions ....

    The question as stated doesn't seem to make sense. Should it be:

    A (n) = -3 (n-1)(-2.2)

    If so, when you put in n=1, the right side is not (-3)*(-2.2). Why not?
     
  8. Nov 4, 2009 #7
    Re: a few questions ....

    it is right the way you wrote it i think i just skipped wrighting it but i dont know whay its not (-3)*(-2.2) its exactly how its written in the book. ugh i am so confused >.<
     
  9. Nov 4, 2009 #8
    Re: a few questions ....

    You made a mistake simplifying -3 (0) (-2.2)
     
  10. Nov 4, 2009 #9
    Re: a few questions ....

    i did how?
     
  11. Nov 4, 2009 #10

    berkeman

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    Staff: Mentor

    Re: a few questions ....

    If you multiply anything by zero, what is the result? Certainly not 6.6
     
  12. Nov 4, 2009 #11
    Re: a few questions ....

    omg i did a blonde ugh so instead it would be
    A(1)=+ -3 (1-1)(-2.2)
    -3 (0)(-2.2)
    -3 (0)
    0
    Right???
     
  13. Nov 4, 2009 #12

    berkeman

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    Staff: Mentor

    Re: a few questions ....

    Much better.
     
  14. Nov 4, 2009 #13
    Re: a few questions ....

    okay so the first one is okay what about the other two did i do those right?
     
  15. Nov 4, 2009 #14
    Re: a few questions ....

    They look good to me
     
  16. Nov 4, 2009 #15
    Re: a few questions ....

    okay for 28 i dont think i did it right but this is what i came up with
    28. Find the first, fourth, and eighth terms of the sequence.
    a(n)=-2X2^-1

    okay thats power to one just to let you know ugh i dont like doing math on the computer ...

    1st
    A(1)= -2x 2^-1
    A(1)= -4
    cause two to the first power is two right?
    then -2 times 2 is negitive four right?
    4th
    A(4)= -2x2^-4
    A(4)= -2x16
    A(4) = -32

    8th
    A(8)= -2 X2^-8
    A(8)= -2 x 256
    A(8)= -512

    anything like that this one really confused me ! see neither of my teachers taught me this before i started homeschooling and i hit this bump and there is nothing on this!
     
  17. Nov 4, 2009 #16
    Re: a few questions ....

    I am a little confused by your notation. Should the 'X' in the formula denote multiplication? You should state the question EXACTLY as written.
    x1 = x for any number x, so writing it out that way is a waste of time.
    However, x-1 = 1/x (except when x=0)
    So, for example, 2-1 = 1/2 = 0.5
     
    Last edited: Nov 4, 2009
  18. Nov 4, 2009 #17
    Re: a few questions ....

    yes x is multiplication i couldnt remember that the * was the sign of multiplication i am so sorry
     
  19. Nov 4, 2009 #18
    Re: a few questions ....

    x does mean multiplication but you totally confused me ...
     
  20. Nov 4, 2009 #19
    Re: a few questions ....

    So is the function a(n) = (-2)(2-1) or is it a(n) = (-2)(2-n)? because while doing the problems you are treating a(n) as the latter.

    Also, n-1 = 1/n
     
  21. Nov 4, 2009 #20
    Re: a few questions ....

    it the first one a(n) = (-2)(2-1)
     
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