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Bad White [126]
2 years ago
8

Please help quickly this is timed

Mathematics
2 answers:
liberstina [14]2 years ago
5 0

Answer:

the one you have selected is correct

Step-by-step explanation:

Gnesinka [82]2 years ago
4 0

oh exactly, go on"QuickMath" or "Cymath" at your browser. all your problems can be solved

Step-by-step explanation:

thanks :)

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How many liters of water vapor can be made from 34.0 grams of oxygen gas and excess amount of hydrogen gas at STP?
AVprozaik [17]
8.2 L is the correct answer
7 0
3 years ago
Hats and mittens are on sale at the store! One woman was able to buy 5 hats and 4 pairs of mittens for $30.
aalyn [17]

The price of one hat is $2 and one pair of mittens is $5

Step-by-step explanation:

Hats and mittens are on sale at the store!

  • One woman was able to buy 5 hats and 4 pairs of mittens for $30
  • Another woman purchased 3 pairs of mittens and 2 hats for $19
  • The price of one hat is x
  • The price of one pair of mittens is y

We need to find x and y

∵ One woman was able to buy 5 hats and 4 pairs of mittens for $30

∵ The price of one hat is x

∵ The price of one pair of  mittens is y

- Multiply 5 hats by x and 4 pairs of mittens by y and equate

  their sum by 30

∴ 5x + 4y = 30 ⇒ (1)

∵ Another woman purchased 3 pairs of mittens and 2 hats for $19

- Multiply 2 hats by x and 3 pairs of mittens by y and equate

  their sum by 19

∴ 2x + 3y = 19 ⇒ (2)

Now we have a system of equations to solve it

Multiply equation (1) by -2 and equation (2) by 5 to eliminate x

∵ -10x - 8y = -60 ⇒ (3)

∵ 10x + 15y = 95 ⇒ (4)

- Add equations (3) and (4)

∴ 7y = 35

- Divide both sides by 7

∴ y = 5

Substitute the value of y in equation (1) or (2) to find x

∵ 2x + 3(5) = 19

∴ 2x + 15 = 19

- Subtract 15 from both sides

∴ 2x = 4

- Divide both sides by 2

∴ x = 2

The price of one hat is $2 and one pair of mittens is $5

Learn more:

You can learn more about the system of equations in brainly.com/question/2115716

#LearnwithBrainly

8 0
3 years ago
Someone help PLZ.
Novay_Z [31]

a and c i think

the blue circle is all the people who had brothers one name was in the blue circle so one person had a brother but the in between part of the too circles are who had both a brother and a sister so the is one name in the between purple  so you count that one to for brother and for sisters

there were  2 people that had brother

 and four people that had sisters

and one that had both


3 0
3 years ago
What is the answer to this problem?
Sedaia [141]

Answer:

x = 4.

Step-by-step explanation:

These are exterior  alternate angles which are congruent.

So 21x + 6 = 90

21x = 84

x = 4.

8 0
2 years ago
What is the solution to:<br><img src="https://tex.z-dn.net/?f=6%20%5Cgeqslant%20%20%5Cfrac%7B1%7D%7B2%7D%20x%20%2B%2021" id="Tex
Vladimir79 [104]
I really hope this helps. Btw x<-30

7 0
3 years ago
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