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Basile [38]
3 years ago
12

What is the value of x and what is the length of MN?

Mathematics
1 answer:
Galina-37 [17]3 years ago
5 0

Answer:

Step-by-step explanation:

\frac{3x+4}{12}=\frac{15}{6}\\3x+4=30\\3x=26\\x=\frac{26}{3}\\MN=3x+4=30

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The sizes of four cell phone displays are 5.6 inches, 53
swat32

Answer: The longest display is 47.75 inches longer than the shortest display.

Step-by-step explanation:

3 0
3 years ago
Given the equation 5x − 4 = –2(3x + 2), solve for the variable. Explain each step and justify your process.
blagie [28]
A.
5x-4=-2(3x+2) \ \ \ \ \ \ \ \ \ |\hbox{expand the bracket} \\
5x-4=-2 \times 3x-2 \times 2 \\
5x-4=-6x-4 \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{add 6x to both sides} \\
11x-4=-4 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{add 4 to both sides} \\
11x=0 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{divide both sides by 11} \\
x=0

B.
3(2x-4)=5x-1 \\
6x-12=5x-1 \\
\boxed{11x-12=-1} \Leftarrow \hbox{the first mistake} \\
11x=11 \\
\boxed{x=11} \Leftarrow \hbox{the second mistake}

Megan's solution isn't correct.
The first mistake: she subtracted 5x from the right-hand side of the equation, but added 5x to the left-hand side.
The second mistake: she divided the right-hand side of the equation by 11, but didn't divide the left-hand side.

The correct solution:
3(2x-4)=5x-1 \ \ \ \ \ \ \ \ \ \ \ |\hbox{expand the bracket} \\
3 \times 2x+3 \times (-4)=5x-1 \\ 6x-12=5x-1 \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\hbox{subtract 5x from both sides} \\
x-12=-1 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \  |\hbox{add 12 to both sides} \\
x=11
3 0
3 years ago
What is 3/2 in a mixed number
antoniya [11.8K]
Bonjour ,
 
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3 years ago
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What is the perimeter of a rectangle with a length of 4x-6 and a width of 2x+3
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Answer:

I got p=12 i'm so sorry if the answer is wrong

Step-by-step explanation:

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