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viktelen [127]
3 years ago
9

PLease help if its right you get brainliest. No cap. Also please make sure you get it right. Lol

Mathematics
2 answers:
ahrayia [7]3 years ago
6 0

Answer:

63

Step-by-step explanation:

1 : 21

2 : 42

3 : 63

Hopefully this helps!

Mrrafil [7]3 years ago
5 0

Hello Jason!

<u>ANSWER:</u>

<u></u>

B.

Hopefully, this helps you!!

:D

AnimeVines

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Step-by-step explanation:I need the same answer lol

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to arrive at 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution. How many liters of eac
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Answer:

<u>800 liters</u> of 90% saline solution and <u>1200 liters</u> of 40% saline solution should be used.

Step-by-step explanation:

Given:

At 2000 liters of 60% saline solution the attendant has to mix a 90% and a 40% saline solution.

Now, to find the number of liters of saline solution each should be used.

<u><em>Let the liters of 90% saline solution mix be </em></u>x.<u><em /></u>

<u><em>And let the liters of 40% saline solution mix be</em></u> y.

So, the total number of liters:

x+y=2000.

y=2000-x\ \ \ ....(1)

Now, the total percentage of saline solution:

90\%\ of\ x+40\%\ of\ y=60\%\ of\ 2000

\frac{90}{100}\times x+\frac{40}{100}\times y=\frac{60}{100}\times 2000

0.9x+0.4y=1200

Substituting the value of y from equation (1) we get:

0.9x+0.4(2000-x)=1200

0.9x+800-0.4x=1200

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Subtracting both sides by 800 we get:

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Dividing both sides by 0.5 we get:

x=800.

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Now, substituting the value of x in equation (1) to get the liters of 40% saline solution:

y=2000-x

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y=1200.

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Therefore, 800 liters of 90% saline solution and 1200 liters of 40% saline solution should be used.

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3 years ago
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nataly862011 [7]

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Average rate of change is the slope (m) between the two coordinates (-1, -1) and (1, -2).

m=\dfrac{y_2-y_1}{x_2-x_1}

m = \dfrac{-2+1}{1+1}

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Answer:

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