Question 394658
We can find the exact values of b and k. Since the sequence is geometric, the quotient between two successive y-values (for example 190/75) must be constant. I can tell that the values are rounded, since the quotient is not quite constant, but for each pair of y-values, the quotient is approximately 2.5, so b = 2.5. Also, since 30 = k*(2.5)^1 (using the value (1, 30)) we can get k = 12 (approx.). The graph might look something like this:


{{{graph(100, 300, 0, 4, 0, 500, 12*(2.5)^x)}}}


The equation is, of course, not linear, but you can use a linear regression to find a line of best fit. However I haven't taken statistics yet, I've only taken the calculus courses at my school :)