Yep that's the right answer man great job!
I am using the laws:
1)

2)

3)

an x is a base - the law is valid if the bases are the same number!
The solution in attachment :)
Answer:
$641.91
Step-by-step explanation:
A(t) = 570(1+0.02)^6
(0,0)(1/3,7/3)
slope = (7/3 - 0) / (1/3 - 0) = (7/3) / (1/3) = 7/3 * 3 = 21/3 = 7 <==