Math

posted by .

Okay, so I know this should be really easy but my mind is just drawing a blank:

For each series, calculate t12 and S12
a) 37 + 41 + 45 + 49 + ...

Okay so I calculated S12 to be 708, and I know that's right.

For t12, I know I can easily find the general formula and then use that to find t12, but isn't there a faster way to do it knowing that the sum is 708?

  • Math -

    Oh. I guess the point of the question was for you to find t12 first by using the general formula so that you could have the last term, which would allow us to use the simpler arithmetic series formula, i.e., n(t1+tn)/2 rather than n/2(2a+(n-1)d)

    But I'd still like to know if there IS a way to find t12 with S12, just in case that comes up later or something.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. college

    Use the Microsoft Web site microsoft. com/ windows/ compatibility to research whether a home or lab PC that does not have Windows Vista installed qualifies for Vista. Fill in the following table and print the Web pages showing whether …
  2. English

    Hello, i'm writing an essay about how truth should be told because it will help materialize solutions to problems and difficulties, etc. Can you please help me start my introduction?
  3. Chemistry

    An electron ps from the 6th to te 3rd energy level in the hydrogen atom: a) calculate the wavelength b) calculate the frequency c) calculate te enrgy d) into which spectral series would the photon be grouped?
  4. Calculus

    I'm studying infinite series and am really struggling with memorizing all the tests for convergence in my book, there's like 10 of them. I don't think I'm going to be successful in memorizing all of them. I will never be asked in my …
  5. math

    t11=19 and t17=61.then what will be S12? arithmetic series question
  6. Math

    Is there a way to find the term number of a sum in an arithmetic series?
  7. Chemistry

    Okay, I feel like this question should be really easy because it's a multiple choice question but how do you figure it out?
  8. Math

    I really need help with this question please Break-even equation. Fill in the blank. The following table contains selected data concerning several outpatient clinics in the new Ambulatory Care Center at Hope University Hospital. Fill …
  9. biology (fill in the blanks)

    Big picture of natural selection/ keep in mind… Natural selection doesn’t move in a BLANK BLANK Natural selection is not a BLANK process Natural selection isn't BLANK; Its all relative to the BLANK. Its from a study form. These …
  10. math please help

    Point X is on line AC such that AX = 3 CX = 12. If <ABC = <BXA = 90 degrees, then what is BX?

More Similar Questions