Question

Question 8 of 20

What is the common difference between consecutive terms in the following
arithmetic sequence?
51, 47, 43, 39,
O A 3
B. -4
O C4
O D -3

Answer 1

B. -4

Explanation:

To find the common difference, d, we simply say 2nd term= 1st term + d

then we transpose to find d

first term is 51

the second term is 47

d is unknown

47=51+d

47-51=d

d= -4

TO CHECK THIS

we substitute d= -4 into the expression to see if we will get back the same term

39= 43 + (-4)

and yes we get back 39

so the common difference is -4