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ayoismeisalex
05.10.2019 •
Mathematics
Adream club charges $60 for the first month of membership, and $2 less each month after that. (yes, after a while the dream club starts paying money to members instead of charging them : what is the total membership for a year? for 5 years?
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Ответ:
Total membership for a year is $588
Total membership for 5 years is $60
Step-by-step explanation:
This is an arithmetic sequence of the form:
60, 58, 56, 54 ...
The first term is a = 60
the common difference is d = -2
We need to find the total member cost for a year, that is the sum of all the first 12 terms. We use the formula of sum of arithmetic sequence shown below:
Where
a is first term
n is the number of term [here, 12]
d is common difference
From what we know, we can find:
Total membership for a year is $588
Now to find this for 5 years, we have to find 5*12 = 60 months.
So S_60, formula and find:
Total membership for 5 years is $60
Ответ:
what is the question? step-by-step explanation: