find the sum of the first 12 terms if an=7-5n
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find the sum of the first 12 terms if an=7-5n
find the sum of the first 12 terms if an=7-5n
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Answer:
s12=-45
Step-by-step explanation:
an=7-5n
a1=7-5(1)
a1=7-5
a1=2
an=7-5n
a12=7-5(12)
a12=7-60
a12=-53
sn=n/2(a1+an)
s12=12/2(2-53)
s12=6(-51)
s12=-45