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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