Asked by Tola
The 2nd and 5th term of a.p are -7 and 56 respectively find the first term. The common ratio. The sum of the five term
Answers
Answered by
amira
A student reads 45 pages in 2 h and x pages in 3 h.
Answered by
Reiny
please don't tag on your question as an answer to somebody else's.
We would think it has been answered.
We would think it has been answered.
Answered by
Reiny
Use your definitions:
a+d = -7
a+4d = 56
subtract them:
3d = 63
d = 21
back in a+d=-7
a+21 = -7
a = -28
sum(5) = (5/2)(-56 + 4(21)) = 70
or
sum(5) = (5/2)(first + last)
= (5/2)(-28 + 56) = 70
check:
our terms are:
-28 -7 14 35 56 ---> add them up to get 70
a+d = -7
a+4d = 56
subtract them:
3d = 63
d = 21
back in a+d=-7
a+21 = -7
a = -28
sum(5) = (5/2)(-56 + 4(21)) = 70
or
sum(5) = (5/2)(first + last)
= (5/2)(-28 + 56) = 70
check:
our terms are:
-28 -7 14 35 56 ---> add them up to get 70
Answered by
Anonymous
Find the sum of the following series
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