if the first terms of an arithmetic sequence is 5 what could be sum of the first terms
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Answer:
There is a formula for the sum of
n
terms of an A.P.
S
n
=
n
2
[
2
a
+
d
(
n
−
1
)
]
FRom the information given, we know that:
n
=
10
a
=
5
,
d
=
−
8
substitute the values
S
10
=
10
2
[
2
(
5
)
−
8
(
(
10
)
−
1
)
]
S
10
=
5
[
10
−
80
+
8
]
S
−
10
=
5
×
−
62
=
−
310
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