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Troyanec [42]
3 years ago
12

43 Points

Mathematics
2 answers:
Anarel [89]3 years ago
8 0

Answer:

I and III only

Step-by-step explanation:

I and II only is correct. Exponential decay functions have the form f(x) = abx + c. Function I is already in this form, and function II can be rewritten by changing

1

2

to 2-1, and then getting 2-x.

MrRa [10]3 years ago
4 0

f(x)=b(a)^x\\\\exponential\ decay\ for\ b>0\ and\ a\in(0,\ 1)\ or\ for\ b1.\\\\I.\ f(x)=3\cdot5^{-x}=3\cdot\left(\dfrac{1}{5}\right)^x\to b=3>0\ and\ a=\dfrac{1}{5}\in(0,\ 1)\ \ \boxed{!}\\\\II.\ f(x)=\left(\dfrac{1}{2}\right)^x\to b=1>0\ and\ a=\dfrac{1}{2}\in(0,\ 1)\ \ \boxed{!}\\\\III.\ f(x)=-7e^x+8\to b1\ \ \boxed{!}\\\\Answer:\ C)\ I,\ II\ and\ III.

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Step-by-step explanation:

1. The expression for c in the first equation is (30m+50). Substituting that for c in the equation ...

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2. Adding -50-20m to both sides gives ...

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You get the same solution.

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