An app developer projects that he will earn $20.00 for every 8 apps downloaded. Write an equation to represent the proportional
relationship between the number of apps and the total earnings.
1 answer:
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Since there are only 4 terms in the sum, it's not too much work to expand it as
Alternatively, we can use the well-known formulas
These sums start at n = 0, so in our given sum we will keep track of the 0-th term separately:
as expected.