Question

Determine if the sequence below is arithmetic or geometric and determine the common difference / ratio in simplest form.

20, 15, 10

Answer 1

a. T² - T¹ = d ( A. P) -5

b. T²/T¹ = r (G. P) 3/4

Explanation:

a. 15 - 20 = -5

b. 15/20 = 3/4

Answer 2

This is an arithmetic sequence and the common difference is equal to -5.