Hi there!

We can look at each function, f(x) and g(x), to determine which is exponential.
Use slope formula: m = y2-y1/x2-x1
f(x) starts off with a slope at about $1800/year, but becomes about $1100/year.
g(x) starts off with a slope of about $1500/year, but becomes about $1874/year.
Thus, g(x) is exponential, because g(x)'s slope is increasing across the interval.
Answer: Number 1 would be F
Number 2 would be C
Number 3 is D
Number 4 is B
Number 5 is A
Number 6 is E
Step-by-step explanation:

Plug in what we know:

Multiply:

Add this to the original amount.

So he will have $6000 in his account after 5 years.