Question

Which of these is not a geometric sequence?

4, 12, 20, 28, ...
5, 15, 45, 135, ...
3, 6, 12, 24, ...
250, 50, 10, 2, ....

Answer 1

3, 6, 12, 24, ... (not a geometric sequence)

Answer 2

y = ax, where a is greater than zero but not equal to 1 and x is an exponent
1. exponential decay
2. exponential function decline of a quantity that is directly proportional to the amount present
3. exponential growth

Answer 3

2. exponential function