Answer: y = 345,000 * (1 + 0.012)^x
Explanation: The population of bats can be modeled by an exponential growth equation of the form:
y = 345,000 * (1 + 0.012)^x
Where x represents the number of years. The initial population of bats is 345,000 and the average annual growth rate is 1.2%, represented by the factor of 1 + 0.012.