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3 years ago

Cause I lowkey suck at math How do I do this

Mathematics

1 answer:

dimaraw [331]3 years ago

5 0

1. The slope is -2/5 not 3-/10

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What is f–1(8)?? 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

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HELP BEFORE TOMORROW PLZZZ (show how to solve it plz)

Zepler [3.9K]

40/1.4=28.57 i think this is right

6 0

3 years ago

The length of a rectangle is 3 cm more than twice the width. The area of the rectangle is 65 square centimeters. Find the dimens

polet [3.4K]

Answer:

5 cm and 13 cm

Step-by-step explanation:

Let b be the width of the rectangle.

Length = 3+2b

The area of the rectangle is 65 cm²

We need to find the dimensions of the rectangle. The area of a rectangle is given by :

A = lb

$65=(3+2b)b\\\\65=3b+2b^2\\\\3b+2b^2-65=0\\\\b=5\ cm,-6.5\ cm$

Neglecting the negative value, the width of the rectangle is 5 cm.

Length = 3+2b

=3+2(5)

=3+10

=13 cm

Hence, the dimensions of the rectangle are 5 cm and 13 cm.

6 0

3 years ago

Solve for u. 10 + 6u = 7u u =

slega [8]

Answer:

u = 10

Step-by-step explanation:

10 + 6u = 7u

10 = u

Just subtract 6u on both sides.

8 0

3 years ago

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pls help - will give brainliest farmer is painting a new barn. He will need to calculate the surface area of the barn to purchas

Brut [27]

Answer:

m^2

Step-by-step explanation:

You only need the surface area, which means you will not use cubed (^3). But the surface area is two dimensions (length and width). SO you must use m^2.

6 0

3 years ago

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