Answer:
C. f(x) = 40(1/4)^x
Step-by-step explanation:
Check all the options:
When x = 0
A. f(x) = 1/4(40)^x
f(x) = 1/4(40)^0
f(x) = 1/4(1)
f(x) = 1/4
B. f(x) = 1/2(40)^x
= 1/2(40)^0
= 1/2(1)
f(x) = 1/2
= 40(1/4)^0
= 40(1)
= 40
D. f(x) = 4(1/3)^x
= 4(1/3)^0
= 4(1)
= 4
-0.9
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