please help I will reward & be soo grateful! (It's Algebra 1)

Find the average rate of change from x=7 to x=14 for the function f(x)=0.01(2)x and choose the correct answer:

1. 23.22
2. 35.84
3. 128
4. 163.84

Question

please help I will reward & be soo grateful! (It's Algebra 1) 

Find the average rate of change from x=7 to x=14 for the function f(x)=0.01(2)x and choose the correct answer:

1. 23.22 
2. 35.84
3. 128
4. 163.84

campbell_st · Answer

find f(14) and f(7) by substitution 

then  the average rate of change is 

$$\frac{f(14) - f(7)}{14 - 7}$$

anonymous · Answer

is the 3rd answer correct? Sorry I don't have a lot of time if not can you tell me the correct one and why? @campbell_st

campbell_st · Answer

I haven't done the calculation, I just explained how you can do it.

anonymous · Answer

Ok thanks anyways @campell_st