Question

look at the patter 6 10 14 18 22 26 write the last number of the 18th line and last number of the 20th line and sum

Answer 1

Step-by-step explanation:

Sum of finite series members

The sum of the members of a finite arithmetic progression is called an arithmetic series.

Using our example, consider the sum:

6+10+14+18+22+26+30+34

This sum can be found quickly by taking the number n of terms being added (here 8), multiplying by the sum of the first and last number in the progression (here 6 + 34 = 40), and dividing by 2:

n(a1+an)

2

8(6+34)

2

The sum of the 8 members of this series is 160

This series corresponds to the following straight line y=4x+6