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allochka39001 [22]
3 years ago
13

Please explain as well 3x+5y=21 4x-2y=-244x−2y=−24

Mathematics
1 answer:
hodyreva [135]3 years ago
3 0

Step-by-step explanation:

3x + 5y = 21 * (-4) •••••• -12x -20y = -84 (a)

4x - 2y = -24 * (3) •••••• 12x -6y = -72 (b)

(a) + (b)

-26y = -156

y = 6

3x + 5 * 6 = 21

3x = 21 - 30

3x = -9

x = -3

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There are 10,000 people at a concert.
frozen [14]

Answer:

62.5%

Step-by-step explanation:

Total number of people at the concert = 10000

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Percentage of adults = number of adults/ total number of people at the concert x 100%

That’s

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0.625 x 100%

62.5%

62.5% of the people at the concert are adults

4 0
3 years ago
If mia Khalifa was black what would her situation be
dedylja [7]

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8 0
3 years ago
Find value of x such that the data set has a mean of 105: 99, 119, 106, 112; 108
Marizza181 [45]
I'm assuming that x is part of the data set, and, with x, the mean equals 105. To find the value of x, you must add all the data values together to get 544+x (you still don't know what x equals). Then put 544+x over how many days values there are, including x (there are 6). You should have 544+x/6. Now, as this is how you would calculate the mean if you knew what x was equal to, you must set it equal to the mean, since you know what it is (105). You should now have 544+x/6 = 105. You have your equation set up--now you just have to solve it. I would multiply by 6 on both sides to get rid of the 6 on the left side. You would then have 544+x = 630. I would finally subtract 544 from both sides to get x = 86. Your final answer is x = 86.
6 0
2 years ago
*Awarding Brainliest to first responder with the correct answer!*<br><br> What is m∠CDJ ?
Bogdan [553]

Answer:

Step-by-step explanation:

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5 0
3 years ago
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