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3 years ago

6

In a fish tank , 8/11 of the fish have a red stripe on them. If 16 of the fish have red stripes, how man total fish are in the t

ank? (Show proportion)

1 answer:

Basile [38]3 years ago

6 0

Answer:

Step-by-step explanation:

8/11 is equal to x/20

Cross multiply

8 times 16 and 11 times x

128=11x

Divide

Then you get 11/128

Divide and simplify!!

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please help! functions and relations. f(x)= square root of x-4. find the inverse of f(x) and it’s domain.

likoan [24]

ANSWER:

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

STEP-BY-STEP EXPLANATION:

We have the following equation:

$f(x)=\sqrt{x}-4$

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

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

The domain would be the range of the original equation, and it would be the range of values that f(x) could take, which was from -4 to positive infinity, that is, f(x) ≥ -4.

Therefore, the domain is x ≥ -4.

So the correct answer is D.

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

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Step-by-step explanation:

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