Question 1192943
30 * 1.4^1 =  42
30 * 1.4^3 = 82.32
30 * 1.4^5 = 161.3472


i suspect that your 6 years should be 5 years.
it works with 5.
it doesn't work with 6.
if it's exponential, the rate should be the same for all.
the equation, as far as i know, should be y = 30 * 1.4 ^ x
here's my graph of the equation.


<img src = "http://theo.x10hosting.com/2022/040511.jpg" >


the exponential formula is y = a * b ^ x
in this problem, a = 30 and b = 1.4