SOLUTION: For the sequence given by an=4n+5, answer the following: a. Find the first five terms b. Find the sum of the first 25 terms

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Question 998549: For the sequence given by an=4n+5, answer the following:
a. Find the first five terms
b. Find the sum of the first 25 terms
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Given the rule an=4n+5, the first five terms are for n=1 to n=5...
9,13,17,21,25
The sum of the first twenty-five terms is found by (a25 = 105)...
Sn = (n/2)(a1 + an) = (25/2)(9 + 105) = 1425