Chapter 7 - Exponents and Exponential Functions - 7-2 Multiplying Powers With the Same Base - Practice and Problem-Solving Exercises - Page 431: 64

The terms are Third is -6.8 Seventh is -22.8 Tenth is -34.8

To solve this, a) n=3 as third term A(3) = 1.2 + (3-1)(-4) = 1.2 + (2)(-4) = 1.2 - 8 = -6.8 b) n=7 as seventh term A(7) = 1.2 + (7-1)(-4) = 1.2 + (6)(-4) = 1.2 - 24= -22.8 c) n=10 as tenth term A(10) = 1.2 + (10-1)(-4) = 1.2 + (9)(-4) = 1.2 - 36 = -34.8