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Mathematics
Nikki
5 July, 13:59
In arithmetic sequence a3=0 a7=12 find s10
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Beasley
5 July, 14:38
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In order to solve for a nth term in an arithmetic sequence, we use the formula written as:
an = a1 + (n-1) d
where an is the nth term, a1 is the first value in the sequence, n is the term position and d is the common difference.
First, we need to calculate for d from the given values above.
a3 = 0 and a7 = 12
an = a1 + (n-1) d
0 = a1 + (3-1) d
an = a1 + (n-1) d
12 = a1 + (7-1) d
Solving simultaneously we get,
a1 = - 6
d = 3
The sum would be calculated as follows:
S = (10/2) * (2 (-6) + (10-1) 3)
S = 75
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