Asked by Boadi Yiadom Ellen

Find the sum of first thirteen terms of a linear sequence whose 8th term is 18 and 11th term is 24.
Answered by Boadi Yiadom Ellen
Please solve it for me
Answered by Reiny
Just use your formulas
"8th term is 18" ---> a + 7d = 18
"11th term is 24 ---> a + 10d = 24
subtract them:
3d = 6
d = 2
in a+7d = 18 ---> a + 14 = 18 , a = 4

now use your sum(n) formula
your
a = 4
d = 2
n = 13
Answered by Rich Eugene
Find the sum of the first 13th term of a A P whose 8th term is 18 and 11th term is 24
Answered by Rich Eugene
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