Answer:
4x² - 6x
Step-by-step explanation:
2x(2x - 3)
Distribute 2x into the parenthesis:
2x(2x - 3) = 4x² - 6x
So these are our two equations: ![2x+y=12\\x=y-3](https://tex.z-dn.net/?f=%202x%2By%3D12%5C%5Cx%3Dy-3%20)
Before we can use elimination, subtract y on both sides of the first equation: ![2x=-y+12\\x=y-3](https://tex.z-dn.net/?f=%202x%3D-y%2B12%5C%5Cx%3Dy-3%20)
Now we are able to use elimination. To eliminate the y variable, add the two equations together to get
. From here we can solve for x.
For this, just divide both sides by 3 and your first answer will be ![x=3](https://tex.z-dn.net/?f=%20x%3D3%20)
Now that we have the value of x, substitute it into either equation to solve for y:
![2*3+y=12\\6+y=12\\y=6\\\\3=y-3\\6=y](https://tex.z-dn.net/?f=%202%2A3%2By%3D12%5C%5C6%2By%3D12%5C%5Cy%3D6%5C%5C%5C%5C3%3Dy-3%5C%5C6%3Dy%20)
<u>In short, x = 3 and y = 6.</u>
Answer:
14![cm^{3}](https://tex.z-dn.net/?f=cm%5E%7B3%7D)
Step-by-step explanation:
Volume = Base area x height / 3
Height is 7cm
Base area =
x 3 x 4 = 6
Volume = 6 x 7 / 3 = 14
1 mm : 500 km
Multiply the above equation by 12 to get
12 mm : 6000 km
The 1st selection is appropriate.