Firewood is stacked in a pile. the bottom row has 20 logs, and the top row was 14 logs. each row has one more log than the row above it. how many logs are in the pile?

Since, each row has one more log than the row above it

so, this is arithematic sequence

We are given that

First row is

so,

Last row is

so,

Each row has one more log than the row above it

so,

now, we can find number of rows

we can plug values

we can solve for n

now, we can find total number of logs

now, we can plug values

So,

Number of logs in the pile are 119........Answer

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2