Question 1157178
exponential model is n(t) = ab^t
a = 110
n(t) = 220
t = 18
solve for b
you get:
220 = 110 * b^18
divide both sides of this equation by 110 to get
2 = b^18
take the 18th root of both sides of the equation to get:
2^(1/18) = b
solve for b to get:
b = 1.039259226...
store that in your calculator and then confirm by replacing b with that to get:
n(t) = 110 * (1.039259226...)^18 = 220.
your equation is:
n(t) = 110 * (1.039259226...)^t
here's a graph of that equation after replacing n(t) with y and t with x.


<img src = "http://theo.x10hosting.com/2020/042602.jpg" alt="$$$" >