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Math Help - not sure about a few formulas?

  1. #1
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    not sure about a few formulas?

    Hello, here are a few formulas that will be given to us during an upcoming exam, and i dont know what each one does.

    Tn = a + (n -1)d

    Sn = n/2[2a + (n-1) d]

    Sn = n/2(a +tn)
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  2. #2
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    Quote Originally Posted by simplekin View Post
    Hello, here are a few formulas that will be given to us during an upcoming exam, and i dont know what each one does.

    Tn = a + (n -1)d Mr F says: nth term of an arithmetic series whose first term is a and whose common difference is d.

    Sn = n/2[2a + (n-1) d] Mr F says: Sum of the first n terms of an arithmetic series whose first term is a and whose common difference is d.

    Sn = n/2(a +tn) Mr F says: Sum of the first n terms of an arithmetic series whose first term is a and whose nth term is tn.
    Have you actually studied the material that these formulae relate to? Seriously.
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    Have you actually studied the material that these formulae relate to? Seriously.
    yes, i have in fact, but due to very shady memory, i forgot it, just need to get it set back in place.
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  4. #4
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    Quote Originally Posted by simplekin View Post
    yes, i have in fact, but due to very shady memory, i forgot it, [snip]
    That's why God invented class notes and textbooks.
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