
Concept explainers
To write formula for nth term an and sum of the first 25 terms of the Arithmetic sequence -
a1=100 ; d=−3

Answer to Problem 37RE
Theformula for nth term is an=103−3n and sum of the first 25 terms is 1600 .
Explanation of Solution
Given: ArithmeticSequence: a1=100 ; d=−3
Formula Used:
nth term for an ArithmeticSequence is tn=a+(n−1)d
Sum of an Arithmetic Sequence: Sn=n2[2a+(n−1)d]
Calculation:
Given: ArithmeticSequence: a1=100 ; d=−3
Using above formula, we have:
tn=a+(n−1)d
an=100+(n−1)(−3)an=100−3n+3an=103−3n
Thus, the formula for nth term is an=103−3n .
Sum of an Arithmetic Sequence: Sn=n2[2a+(n−1)d]
S25=252[2(100)+(25−1)(−3)]S25=252[200+24(−3)]S25=252(200−72)S25=252×128S25=1600
The sum is 1600 .
Conclusion:
Hence, the formula for nth term is an=103−3n and sum of the first 25 terms is 1600 .
Chapter 8 Solutions
Precalculus with Limits: A Graphing Approach
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