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Rudik [331]
3 years ago
7

Multiplying Polynomials -(2x – 9)?

Mathematics
2 answers:
olchik [2.2K]3 years ago
6 0
-2x+9. just distribute a -1
diamong [38]3 years ago
3 0

Answer:

everything inside the parenthesis will be opposite since there is a negative sign outside.

So, -(2x-9) will reverse all signs.

Making it result as, -2x+9.

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A coin bank has 250 coins, dimes and quarters, worth $39.25. How many of each type of coin are there?
Brilliant_brown [7]
x-\ number\ of\ dimes\\y-\ number\ of\ quarters\\\\ \left \{ {{x+y=250\ \ \ | x=250-y} \atop {0.1x+0.25y=39.25\ \ \ \ \ \ \ \ \ \ \ \ \ }} \right. \\\\ substitution\ method\\\\
0.1(250-y)+0.25y=39.25\\\\
25-0.1y+0.25y=39.25\\\\
25+0.15y=39.25\ \ \ \ | subtract\ 25\\\\0.15y=14.25\ \ \ \ | divide\ by\ 0.15\\\\y=95\\\\x=250-95=
155\\\\
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8 0
3 years ago
All questions are about this system of equations:
sertanlavr [38]
If we are eliminating x, we would multiply the 2nd equation by -5

5x + 18y = 23
x + 3y = 2....multiply by -5
-----------------
5x + 18y = 23
-5x - 15y = - 10 (result of multiplying by -5)
----------------add
0 + 3y = 13.....bye-bye x :)

6 0
3 years ago
Match each shape on the left with its area formula on the right.
e-lub [12.9K]

Step-by-step explanation:

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List the values that make up the domain of this relation.
balandron [24]

\bf (\stackrel{\downarrow }{5},3),(\stackrel{\downarrow }{2},-7),(\stackrel{\downarrow }{1},-8),(\stackrel{\downarrow }{8},3)\qquad \quad \stackrel{\textit{the domain is always the set of the 1st coordinate}}{(5,2,1,8)}

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photoshop1234 [79]
The answer would be 212 :)
6 0
3 years ago
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