Using an arithmetic sequence, we have that:
a) The formula is:
b) With n = 8, we have that 107 bars were sold in the eight week.
<h3>What is an arithmetic sequence?</h3>
In an arithmetic sequence, the difference between consecutive terms is always the same, called common difference d.
The nth term of an arithmetic sequence is given by:
In which is the first term.
Given the table, the first term and the common difference are, respectively, given by:
.
Hence the equation is:
Then, the number of sales in the 8th week is given by:
Mopre can be learned about arithmetic sequences at brainly.com/question/6561461
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