Which of the Following Formulas Are Exponential?
A) $P(t)=8.9(1.21)^{t}$ B) $P(t)=1.89-9.68 t$

Multiple Choice

Which of the following formulas are exponential?

A) $P(t) =8.9(1.21) ^{t}$
B) $P(t) =1.89-9.68 t$
C) $P(t) =17.8^{t}+40.05 t-22.25$
D) $P(t) =(1.4641) ^{t} 2670$
E) $P(t) =178 e^{2.42 t}$
F) $P(t) =1.78 e^{-0.605 t}$
G) $P(t) =(4.45+12.1 t) ^{t}$