Algebra
posted by Cassie .
Which of these sequences shows exponential growth?
a) 800, 400, 200, 100
b) 800, 1000, 1200, 1400
c) 100, 200, 400, 800, 1600
d) 100, 200, 300, 400, 500
e) 100, 150, 200, 250, 300
I'm pretty sure it isn't d) or e). But what is "exponential growth," exactly?
Thank you!

I think c it's growing periodically

You're right  it's not d or e.
Check this site and I'll sure you'll figure out the right answer.
http://www.answers.com/topic/exponentialgrowth 
Thank you so much! :)