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Airida [17]
3 years ago
13

1. Colored copies cost 10¢ per copy and white copies

Mathematics
2 answers:
Nesterboy [21]3 years ago
7 0

Answer:

350 white copies and 50 coloured copies

Step-by-step explanation:

$0.10 per coloured copy (c)

$0.05 per white copy (w)

$22.50 total bill

c = number of coloured copies

w = number of white copies

400 = number of total copies

<em>Write a system of equations:</em>

c + w = 400; c = 400 – w

0.1c + 0.05w = 22.5

<em>Replace one variable in the more complex equation:</em>

0.1(400 – w) + 0.05w = 22.5

<em>Solve:</em>

0.1(400 – w) + 0.05w = 22.5

40 – 0.1w + 0.05w = 22.5

40 – 0.05w = 22.5

–0.05w = 22.5 – 40

–0.05w = –17.5

w = –17.5 ÷ –0.05

<u>w = 350</u>

c = 400 – w

c = 400 – 116.7

<u>c = 50</u>

kap26 [50]3 years ago
3 0

Answer:

the answer is  A

Step-by-step explanation:i just did it

your welcome

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<h3>What is a linear equation?</h3>

It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.

If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.

We have a linear equation in three variable:

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\rm \mathrm{Substitute\:}x=\dfrac{5-3y+z}{2}   (from the equation 1 and 2)

After solving:

\rm \begin{bmatrix}-7y+z+10=-1\\ \dfrac{5y+3z+5}{2}=12\end{bmatrix}

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Thus, the values of x, y, and z are 1, 2, and 3 respectively after using the substitution method.

Learn more about the linear equation here:

brainly.com/question/11897796

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5 0
2 years ago
Is a reciprocal of an improper fraction sometimes, always, or never a proper fraction? Explain.
Genrish500 [490]
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8 0
3 years ago
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Ray Of Light [21]

Answer:

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Step-by-step explanation:

(-6-8i)-(-9+4i)

distribute the minus sign

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combine like terms

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Nikolay [14]
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5 0
3 years ago
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myrzilka [38]

Answer:

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Step-by-step explanation:

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7 0
2 years ago
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