Question
Find the sum of first thirteen terms of a linear sequence whose 8th term is 18 and 11th term is 24.
Answers
Boadi Yiadom Ellen
Please solve it for me
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
"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
Rich Eugene
Find the sum of the first 13th term of a A P whose 8th term is 18 and 11th term is 24
Rich Eugene
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