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Paha777 [63]
3 years ago
5

Help someone I just need the answer

Mathematics
1 answer:
ehidna [41]3 years ago
4 0
There is no question
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If f(x) and f-1(x) are inverse functions of each other and f(x) = 2x+5, what is f-1(8)?
Alexandra [31]

Answer:

B. 3/2

Step-by-step explanation:

If f(x) and f^{-1}(x) are inverse, that means that if we switch the x and y for f(x) and solve for y, we will get the inverse function.

Knowing that f(x) = 2x + 5, let's write this as y = 2x + 5 and switch the x and y:

x = 2y + 5

Now, solve for y:

x = 2y + 5

x - 5 = 2y

y = (x - 5)/2

That's the f^{-1}(x) function: f^{-1}(x)=\frac{x-5}{2}

Plug in 8 for x:

f^{-1}(x)=\frac{x-5}{2}

f^{-1}(8)=\frac{8-5}{2}=3/2

The answer is thus B.

<em>~ an aesthetics lover</em>

6 0
4 years ago
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Mark simplified three over five divided by five over eight.; his work is shown below. Identify where he made his error. Original
yulyashka [42]

Answer:

step 3

Step-by-step explanation:

3 x 8 = 24 thats correct but 5 x 5 = 25 not 5

i took the test

5 0
3 years ago
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You can buy a 2-pound loaf of bread for $2.50 or a 2-pack of 1 1/2 pound loaves for $3.30. Which is the better buy?
lukranit [14]
The 2 pound pack would be the better one to buy
5 0
4 years ago
What word describes the equal shares of the shape
nexus9112 [7]
The word that describes it is congruent
7 0
3 years ago
In a fruit cocktail, for every 30 ml of orange juice you need 45 ml of apple juice and 25 ml of coconut milk. What proportion of
sveta [45]

Answer: \frac{1}{4}

Step-by-step explanation:

Given

For 30 ml of orange Juice

45 ml of apple Juice is needed and

25 ml of coconut milk is required

The proportion of coconut milk in the cocktail is

\Rightarrow \dfrac{\text{amount of coconut milk}}{\text{total volume of mixture}}\\\\\Rightarrow \dfrac{25}{30+45+25}=\dfrac{25}{100}\\\\\Rightarrow \dfrac{1}{4}

5 0
3 years ago
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