Answer :
An equation is an expression of exponential growth if the base of the exponential term is more than 1 and it is an exponential decay if the base number is less than 1.
A. H=5.9 (0.82)^t
Base number: 0.82 --> exponential decay
B. y=0.8 (3.6)^t
Base number = 3.6 --> exponential growth
C. f(t)=0.72 (15)^t
Base number = 15 --> exponential growth
D. A=4/9 (8)^t
Base number = 8 --> exponential growth
E. A= (4/3)^t
Base number = 4/3 --> exponential growth
F. H= 7/2 (5/6)^t
Base number = 5/6 ---> exponential decay
G. g(x)= 0.3(x)
Base number = 1 --> Neither
A. H=5.9 (0.82)^t
Base number: 0.82 --> exponential decay
B. y=0.8 (3.6)^t
Base number = 3.6 --> exponential growth
C. f(t)=0.72 (15)^t
Base number = 15 --> exponential growth
D. A=4/9 (8)^t
Base number = 8 --> exponential growth
E. A= (4/3)^t
Base number = 4/3 --> exponential growth
F. H= 7/2 (5/6)^t
Base number = 5/6 ---> exponential decay
G. g(x)= 0.3(x)
Base number = 1 --> Neither