3 years ago

Solve the proportion.

Mathematics

1 answer:

Lostsunrise [7]3 years ago

8 0

Answer:

r = 9

Step-by-step explanation:

cross multiply

9 * r = 81

9r = 81

divide both sides by 9

r= 81/9

r = 9

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We have the following equation:

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The inverse is the following (we calculate it by replacing f(x) by x and x by f(x)):

$\begin{gathered} x=\sqrt{f^{-1}(x)}-4 \\ \\ \sqrt{f^{-1}(x)}=x+4 \\ \\ f^{-1}(x)=(x+4)^2 \end{gathered}$

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Therefore, the domain is x ≥ -4.

So the correct answer is D.

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