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Svetradugi [14.3K]
3 years ago
8

Solve each system by substitution

Mathematics
1 answer:
Thepotemich [5.8K]3 years ago
4 0

Step-by-step explanation:

{9x+3y=-36

y=-3x-21

9x-9x-36=-36

y=-3x-21

x=0

y=-21

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A watercolor painting is 20 inches long by 9 inches wide. Raymond makes a border around the watercolor painting by making a mat
sergey [27]

The mat adds 3 inches to each side, so the length would be 3+20 = 23 inches. The width would become 3 + 9 = 12 inches.Area = Length x width:

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4 0
4 years ago
Try the following example. Remember to use the hints if you need them. Solve for x. 2.9×10−7=(x)(x)2(4.6)(4.6)2(3)2 Choose the c
galben [10]

Answer:

2.3\times 10^{-2}

Step-by-step explanation:

Given equation,

2.9\times 10^{-7}=\frac{(x)(x)^2(4.6)}{(4.6)^2(3)^2}

2.9\times 10^{-7}=\frac{x^3}{9\times 4.6}

(\because a^m = \frac{1}{a^{-m}})

By cross multiplication,

2.9\times 9\times 4.6\times 10^{-7}=x^3

120.06\times 10^{-7}=x^3

\implies x = (120.06\times 10^{-7})^\frac{1}{3}

=0.0228980999294

\approx 0.023

=2.3\times 10^{-2}

7 0
3 years ago
Roseanne makes 1 1/2 L of lemonade. She pours 1/4 of liter of lemonade into a thermos to take to the park. Her brother drinks 2/
Elis [28]

Answer:

1/2 L

Step-by-step explanation:

She makes 1 1/2 L of lemonade i.e. 3/2 L of lemonade.

She pours 1/4 of liter of lemonade into a thermos to take to the park. The amount of lemonade left is:

3/2 - 1/4 = 1 1/4 L = 5/4 L

Her brother drinks 2/5 of the remaining lemonade. The amount of lemonade that her brother drinks is:

2/5 * 5/4 = 1/2 L

Her brother drinks 1/2 L.

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Xy = k
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xy = 28
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Divide both sides by 10
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Natasha_Volkova [10]
Do you know how to find 2/3 of 24?
3 0
3 years ago
Read 2 more answers
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