Question

Tell whether the sequence is arithmetic. If it is, identify the common difference.

-7, -3, 1, 5,...
A. Not arithmetic
B. Arithmetic, common difference is 4
C. Arithmetic, common difference is 8
D. Arithmetic, common difference is 7

Answer 1

just test it
-7 + 4 = -3
keep adding 4 and see whether the sequence appears

Answer 2

seriously?

T_T

Answer 3

Arithmetic = going up or down the same units: going down by -4; true
Common difference = how much it is going up: -4

Solution: yes it’s arithmetic. The common difference is -4. The next three terms is -9, -13, -17