<span>For exponential decrease use the formula P(1 - r)^t p: initial amount r: rate of change or percent of decrease (be sure to put in decimal form or you wont get the right answer) t: amount of time (in years) 1,000,000 (1-0.042)^15 = $525,391.01 (also make sure to use pemdas or order of operations when solving) hope this helps :)</span>
