3. A theater has 60 seats in the first row, 68 seats in the second row. 76 seats in the

third row, and so on. If the theater has 20 rows of seats, how many seats are in the 20

row of the theater?

State the arithmetic sequence explicit formula:

List your values below.

an=

d=

an =

State the explicit formula for the problem:

How many seats are in the 20th row?

Question

Mathematics

Moises Rosales

17 September, 23:38

3. A theater has 60 seats in the first row, 68 seats in the second row. 76 seats in the

third row, and so on. If the theater has 20 rows of seats, how many seats are in the 20

row of the theater?

State the arithmetic sequence explicit formula:

List your values below.

an=

d=

an =

State the explicit formula for the problem:

How many seats are in the 20th row?

+5

Answers (1)

Know the Answer?

Ramiro · Answer 1

Step-by-step explanation:

arithmetic sequence: 60,68,76, ...

a = 60

d = 68 - 60 = 8

an = a + (n-1) * d

a20 = 60 + 19 * 8

= 60 + 152

= 112

There are 112 seats in the 20th row