Find the unknown number in the group

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.