help with exponential change!

[mhagen26]

I need help selecting all of which portray an exponential change. thank you!

 

[R.M.]

Where is the variable located in an exponential function? Answer this question, and you will answer the one you posed, which could also be answered by re-reading the definition of an exponential function.

 

[HallsofIvy]

Okay, do you know what "exponential change" means? What does "exponent" mean?