Question

6: Find the common difference of the arithmetic sequence -40, -45, -50, -55, ...

Answer 1

The first term is -40 and the second is -45, in order to find the difference

`-45-(-40)=-45+40=-5`

Therefore, the second term runs 5 units to the left. Following that idea, the third term must be

`-45+(-5)=-45-5=-50`

Finally, the fourth term is founded

`-50+(-5)=-50-5=55`

Therefore, the increment or the common difference is -5.