The 5th term of an arithmetic sequence
is 5 and the sum of the first 5 terms is
55. What is its first term
(a) 15 (b) 16 (c) 17 (d) 18
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1
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WRITING magine your school organised a tree plantation drive in the neighborhood recently. Write a brief report on the drive. include the following points in our report- When and where was the tree plantation drive held? - Who participated in the drive? • What was done by the participants?What was the main objective of the drive?
Explanation:
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Question
The 5th term of an arithmetic sequence
is 5 and the sum of the first 5 terms is
55. What is its first term
(a) 15 (b
Answered by
2
Explanation:
a+a+d+a+2d+a+3d+a+4d=55
a+4d=5
5a+10d=55 1)
a+4d=5. 2)
solving Eqn 1 and 2
-10d=50
d= -5
a+4(-5)=5
a-20=5
a=25
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