in the newspaper ,mr. shields read that the poplulation of jefferson County was decreasing at a rate of 20% every year. is this exponential or linear function ? why ? or why not?
The population function looks like P = Po (1 - 0.20)^t, or Po (0.80)^t. Because the common ratio, 0.80, is between 0 and 1, this equation is appropriate for an exponentially decreasing decreating function.
