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gayaneshka [121]
3 years ago
7

3x+8=15 find try the value of x

Mathematics
1 answer:
bazaltina [42]3 years ago
3 0

3x+8=15

move +8 to the other side

sign changes from +8 to -8

3x+8-8= 15-8

3x= 15-8

3x= 7

divide both sides by 3 to get x by itself

3x/3= 7/3

answer:

7/3 or 2 1/3

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For the function f(x)=5x^3-6, find f^-1
max2010maxim [7]

Answer:

f^{-1} means the inverse function

f^{-1} = \sqrt[3]{(x + 6)/5}

Step-by-step explanation:

f^{-1} means the inverse function

to find an inverse function, flip the x and y variables and solve for y

f(x) = 5x^3 - 6

y = 5x^3 - 6

x = 5y^3 - 6

x + 6 = 5y^3

(x + 6)/5 = y^3

\sqrt[3]{(x + 6)/5} = y

5 0
3 years ago
A web store offers two versions of a popular song. The size of a standard version is 2.9 MB. The size of the high-quality versio
olasank [31]

Answer:

This problem is a great systems of equations problem--you have two different variables: song size and number of songs.

Let's call the number of standard version downloads (S) and the high quality downloads (H).

You can make two statements:

For number of songs downloaded: S + H = 910

For download size: 2.8(S) + 4.4(H) = 3044.

S will be the same number in both equations and H will be the same number in both equations, so to find S, we can rearrange the first statement to H = 910 - S, then substitute or plug in (910 - S) wherever you see an H in the second equation so that you have only S's in your equation. Should look like this:

2.8(S) + 4.4(910 - S) = 3044

2.8S + 4004 - 4.4S = 3044

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s = 600

Your question only asks for the standard version downloads, but to help you out in future Systems situations-

You can also solve for H once you have S by plugging it into either of your equations like this:

600 + H = 910

-600

H=310

Step-by-step explanation:

hope it help

*comment if my answer is wrong*

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3 years ago
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salantis [7]

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3 years ago
How would you go about solving this with geometry?
Marysya12 [62]

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X= 7

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Solve x then Y

4 0
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What is f(x) if y=-3x-1
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Does it give you any numbers for x??
7 0
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