The Sum Of The First 10 Terms Of An Arithmetic Sequence Is 530.What Is The First Term If The Last Term Is 80
the sum of the first 10 terms of an arithmetic sequence is 530.what is the first term if the last term is 80
Answer:
a1=26
Step-by-step explanation:
sn=530
n=10
an=80
a1=?
Formula:
Sn=(n/2)(An+a1)
530=(10/2)(80+a1)
530=(5)(80+a1)
530=400+5a 1
530=5a1+400
5a1=130
a1=26
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