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Consider the arithmetic sequence presented in the table below. What is the first term, a1, and the 22nd term of the sequence? n 5 71 an 42 636 Hint: an = a1 + d(n − 1), where a1 is the first term and d
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Feb 21, 2018
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Consider the arithmetic sequence presented in the table below. What is the first term, a1, and the 22nd term of the sequence?
n 5 71
an 42 636
Hint: an = a1 + d(n − 1), where a1 is the first term and d is the common difference.
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Robik
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Subtract the frist equation from the second equation:
=> 70d - 4d = 636 - 42
66d = 514
=> d = 514 / 66 = 9
Now, find the first term,
And the 22nd term is:
David Groomes
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Feb 28, 2018
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