Question

What is the common difference between the elements of the arithmetic sequence below?

–18, –22.5, –27, –31.5, –36

Answer 1

All numbers in each number add up to 9, i dont know if you understand me,
for example:
1+8=9
2+2+5=9
2+7=9
.....

Answer 2

In mathematics, an arithmetic progression (AP) or arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant. The common difference would be calculated as follows:


–36 - –31.5 = - 4.5
–27 - –22.5 = -4.5

Therefore, the common difference is -4.5.