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3 years ago

9

Question 10 (5 points)

1 answer:

Agata [3.3K]3 years ago

5 0

Answer:

the answer is 20 i just took the test

Step-by-step explanation:

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What is f–1(8)??<br><br> Please select the best answer

notka56 [123]

Answer:

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

Step-by-step explanation:

Given f(x)= $2x+5$

We have to find $f^{-1}(8)$

In order to find $f^{-1}(x)$ we have to make x as the subject of the formula

Let us assume f(x)=y

⇒ $2x+5=y$

Subtracting both sides by 5

$2x+5-5=y-5$

$2x=y-5$

Dividing both sides by 2

$\frac{2x}{2}=\frac{y-5}{2}$

⇒ $x=\frac{y-5}{2}$

Now substituting y with x

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

Now $f^{-1}(8)=\frac{8-5}{2}$

= $\frac{3}{2}$

So option (ii) is correct

5 0

3 years ago

Read 2 more answers

3times square root of 81

algol [13]

27 because the square root of 81 is 9 and 9 times 3 is 27.

7 0

3 years ago

Read 2 more answers

Rhian sat a math test and an english test.In the maths test she scored 14 out of 17.In the english test she scored 31 out of 39.

Dvinal [7]

Answer:

The maths test

Step-by-step explanation:

If you convert both of the results to percentage,

Maths:

$\frac{14}{17} \times 100 = 82\%$

English:

$\frac{31}{39} \times 100 = 79\%$

You'll see that she scored better in the maths test.

4 0

3 years ago

How is 2.5/3=75% equivalent

horsena [70]

Answer:

its equivalent because 75% equals to 75 over one hundred = 75/100 so when you divide 75 by 3 you get 25 but then you have to divide 25 by 10 you get 2.5

Step-by-step explanation:

4 0

3 years ago

WILL GIVE BRAINLIEST HELP!!

Lera25 [3.4K]

Answer is : $\sqrt[4]{5}$

Explanation:
$\frac{ \sqrt[4]{400}}{ \sqrt[4]{5}} = \frac{ \sqrt[4]{4*5*5*2*2} }{\sqrt[4]{5}}$

= $\frac{\sqrt[4]{5*5*2*2*4}}{\sqrt[4]{5}} = \sqrt[4]{5*2*2*4}$

= $\sqrt[4]{5*2*2*4} = \sqrt[4]{80}$
= $\sqrt[4]{2*2*2*2*5}$
= $\sqrt[4]{2^{4}} \sqrt[4]{5}$
= $\sqrt[4]{5}$

5 0

3 years ago