Concept explainers
To find: the number of seats in all 20 rows.
Answer to Problem 76E
There are 590 seats in 20 rows.
Explanation of Solution
Given information:
An auditorium has 20 rows of seats. Therefore are 20 seats in the first row, 21 seats in the second row, 22 seats in the third row.
Given figure,
Concept used:
An arithmetic sequence of n terms, has the form
That is
Common difference can be defined by d .
nth term of the arithmetic sequence has the form
Where
Sum of an arithmetic finite sequence has the form
Here, n is number of terms,
Calculation:
An auditorium has 20 rows of seats there are 20 seats in a first row, 21 seats in the second row.
The common difference between these seats is
Therefore are 20 rows of seats using formula
Hence, there are 590 seats in 20 rows respectively.
Chapter 8 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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