Thursday

January 29, 2015

January 29, 2015

Posted by **Anonymous** on Tuesday, November 3, 2009 at 1:15am.

-How many seats are in the auditorium?

- math -
**Reiny**, Tuesday, November 3, 2009 at 7:31amThis is an arithmetic series

Sum(n) = (n/2)[2a + (n-1)d]

where a is the first term

n is the number of terms

d is the common difference, and

Sum(n) is the sum of the n terms

So you want Sum(49)

with a=40, d=-3 and n = 49

substitute

**Answer this Question**

**Related Questions**

math- Algebra 2 - An auditorium has 49 rows of seats. The first row contains 40 ...

Math - An auditorium has 30 rows of seats. It has 20 seats on the first row, 24 ...

Math - an auditorium has 50 rows of seats. THe first row has 20 seats, the row ...

Math - An auditorium has 50 rows of seats. The first row has 20 seats, the ...

math - Determine the seating capacity of an auditorium with 10 rows of seats if ...

maths - seats are arranged in rows in a auditorium.each row has 5 more than the ...

math - An auditorium has 30 rows with 10 seats in the first row, 12 in the ...

arithmetic - An auditorium has 20 rows of seats.These are 20 seats in the first ...

math (plz help) - In a movie theater, theater A has 30 seats in the first row. ...

math - In a movie theater, Theater A has 30 seats in the first row. Each next ...