Which of the following choices is the explicit formula for the following geometric sequence?

-0.1, 0.02, - 0.004, 0.0008, - 0.00016

A. an = 0.1 (0.2) n

B. an = 0.1 (-0.2) n-1

C. an = - 0.1 (-0.2) n-1

D. an = 0.2 (-0.2) n-1

E. an = - 0.1 (0.2) n-1

For 8 days of very hot weather, the water level in a lake dropped 3 inches per day. on the ninth day, storms raised the level 6 inches. Write and find the value of an expression for the change in the water level of the lake during these 9 days.

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