3 years ago

Seven ninths as a decimal

Mathematics

2 answers:

mars1129 [50]3 years ago

8 0

.7777777778 the calculator says, only because it ran out of room :)

dedylja [7]3 years ago

8 0

7/9 as a decimal is 0.77777778

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$\:D.\text{ }f^{-1}\left(x\right)=\left(x+4\right)^2;x\ge-4$

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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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