Which function represents the sequence –7.25, –6.75, –6.25, –5.75, … ? a. b. c. d.

Explanation: Let's form the arithmetic progression. For the sequence, not the sum, we use this form:

, a is the first term and d is the common difference.
Now each term goes up by 0.5, so d is 0.5

Substituting everything in, we get:


and we can verify this is true if we substitute n = 2, for -6.75 and so on.