Exponential Growth

Warmup #1:

Which of these images shows exponential growth?

Warmup #2:

The function shows the growth of a fruit fly population. f(t) is the number of fruit flies after t days.

What is the initial population of the fruit flies?

Warmup #3:

The function shows the growth of a fruit fly population. f(t) is the number of fruit flies after t days. 
What is the growth factor for the fruit fly population? $f\left(t\right)=100\left(1.05\right)^t$ 

Warmup #4: 

The function shows the growth of a fruit fly population. f(t) is the number of fruit flies after t days. 

About how many fruit flies are in the population after 7 days?