Chapter 7 - Exponents and Exponential Functions - 7-2 Multiplying Powers With the Same Base - Practice and Problem-Solving Exercises - Page 431: 63

The terms are Third is -1 Seventh is 7 Tenth is 13

To solve this, a) n=3 as third term A(3) = -5 + (3-1)(2) = -5 + (2)(2) = -5 + 4 = -1 b) n=7 as seventh term A(7) = -5 + (7-1)(2) = -5 + (6)(2) = -5 + 12 = 7 c) n=10 as tenth term A(10) = -5 + (10-1)(2) = -5 + (9)(2) = -5 + 18 = 13