What is the common difference between the elements of the arithmetic sequence below? –18, –22.5, –27, –31.5, –36

Answer
Common difference = -4.5

Explanation.
An arithmetic sequence is a sequence in which the next term is found by adding a constant to the current term. This constant is called the common difference.
If a, b, c, d, e, ….is an arithmetic sequence, then the common difference will be,
Common difference = b-a=c-b=d-c=e-d…..
Now the question above common difference is;
Common difference = (-22.5)-(-14)=-4.5 

1.5 pounds because you put 9over 6 and then divide by 6