Answer:
Exponential Growth: y = a(1 + r)x
Exponential Decay: y = a(1 - r)x
Step-by-step explanation:
Remember that the original exponential formula was y = abx.
You will notice that in these new growth and decay functions,
the b value (growth factor) has been replaced either by (1 + r) or by (1 - r).
The growth "rate" (r) is determined as b = 1 + r.
The decay "rate" (r) is determined as b = 1 - r