the population of a town is increasing at a rate of 3.4% every year. is this and example of a linear function, an exponential function, or neither ?

It would be linear because it’s moving constantly at the same rate and not changing

By what percentage does the population decrease each year? Round to 2 ... for the quantity, Q, of a 30 gram sample remaining after t years? ... The following table gives values from an exponential or a linear function