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Question
Submitted by k3sh on Fri, 2013-02-08 03:53
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answered 2 time(s)
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Here are the first 5 terms of an arithmetic sequence: 2,9,16,23,30 a)write down,in terms of n,an expression for the nth term of...

Here are the first 5 terms of an arithmetic sequence: 2,9,16,23,30 a)write down,in terms of n,an expression for the nth term of this sequence b)Joanna says that 344 is a term in this sequence. Is Joanna right? You must fully explain your answer

Answer
Submitted by Grafa on Fri, 2013-02-08 06:21
teacher rated 79 times
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price: $0.00

sequence

2,9,16,23,30

2, 2+7*1, 2+7*2, 2+7*3.. so it is 2+n*7 (where n = whole number)

 

344: 344-2=342/7 = 48.85 what is not a whole number. She is wrong

Answer
Submitted by mathsexpert on Fri, 2013-02-08 09:11
teacher rated 5 times
4
price: $1.00

the answer is correct

body preview (55 words)

 

xx xxxxxxx xxxx = a = xxx

  xxxxxx xxxxxxxxxx x d x x2 - a1 x x x x = 7

xx nth xxxx x xx x x + x x x x x x

xx   xx   xx       xx xx an x x + x x x x )7

xx       xx xx xx   xx xx   xx xxx x x xx - 7

  xx xx xx     xx xx xx       =  7n x x

let 344 be term xx xxxxx x x

xx xxxxx x 2 x x n x x x x

xx 344  = x x 7n - 7

xx  344 xxx  7n - x

xxxxx x x = 7n

xx xxx x 7 = n

xx xxx = xxxxx

  xxxx xx xxx x whole no. so xxx xx xxx x term of given A xxx

xx


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