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cluponka [151]
4 years ago
5

A numbr increased by 4 is the same as 19 minus 2 times that number (x+4=19-2x) solve for x

Mathematics
1 answer:
k0ka [10]4 years ago
4 0
x- number\\\\
x+4=19-2x\ \ \ |Subtract\ x\\\\
4=19-2x-x\\\\
4=19-3x\ \ \ |Subtract\ 19\\\\
4-19=-3x\\\\
-15=-3x\ \ \ |Divide\ by\ (-3)\\\\
x=5\\\\
\textbf{Number\ is\ 5.}

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A rectangular field has an area of 162 m² the width of this field is 9m what is the perimeter of this field
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Answer:

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Step-by-step explanation:

Alrighty, what have we here: an area of 162 m² and a width of 9m.

So: A=162m², W=9m, let's draw this: (see the screenshot attached)

Using the formula for area (Area = width x length) we see that:

162m^{2} =9m*L

Thus: (equating to L by dividing both sides by 9m)

⇒ \frac{162m^{2} }{9m}=18m=L

Now we have all of our dimensions, we can use the formula for the perimeter to calculate it:

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And there we have our answer.

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