# Chapter 4 - An Introduction to Functions - 4-7 Sequences and Functions - Standardized Test Prep - Page 279: 59

The sequence is arithmetic. Recursive formula : A(n) = A(n - 1) - 0.8 ; A(1) = 0.2 Explicit formula : A(n) = 0.2 + (n - 1)(-0.8)

#### Work Step by Step

The sequence is arithmetic because there is a common difference between all the terms which is -0.8 Explicit formula- For this formula we need to find the d value and A(1) and we can find the d value by subtracting the second term from the first. D = -0.6 - 0.2 D= -0.8 A(1) = 0.2 ; We can now form the equation A(n) = 0.2 + A(n - 1)(-0.8) Recursive- For this formula, we need the common difference and A(1) and since the common difference is the same as the d value in the explicit formula, we can use that. Common difference = -0.8 A(1) = 0.2; We can now form the equation A(n) = A(n - 1) -0.8 ; A(1) = 0.2

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