Which statements are true about decay functions

Well maybe give me some options. But the statements that are true about decay functions are exponential decay are; the domain is all real numbers, the base must be less than 1 and greater than 0 and the function has a constant multiplicative rate of change. The answers are letters A, D and E. An example is when there are 70000 bacteria present in a culture and reduced by half every four hours, the number of bacteria will decrease. The bacteria will experience an exponential decay because it decreases its number at a constant decay. 

Hope it helps!

what are the things "represented below"?

step-by-step explanation:

nobody can if you dont give the choices