MILAGROSALAYANGO
Answered

1. An auditorium has 20 seats on the first
row, 24 seats on the second row, 28 seats
on the third row, and so on and it has 32
rows of seats.
How many seats are there in the 10th row.​

Sagot :

ONEKPHGO

Answer:

56

Step-by-step explanation:

Arithmetic Progression

Why,

If a3-a2=a2-a1 or the common difference is the same

Then,

28-24=24-20

4=4, So it is an Arithmetic Progression

The Formula is

an=a1+(n-1)(d)

Find a10, where n=10, d=4 and a1=20

Substitute to the formula

a10=20+(10-1)(4)

a10=56

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