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erik [133]
1 year ago
11

If 2x+z=2y and 2x+2y+z=20 what is the value of y?

Mathematics
1 answer:
mixer [17]1 year ago
3 0
2x+z=2y\to2x=2y-z\\\\substitute\ to\ 2x+2y+z=20:\\\\(2y-z)+2y+z=20\\2y-z+2y+z=20\\4y=20\ \ \ \ /:4\\y=5\to answer
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You open a business selling school supplies and tutoring sessions. In your first week, you had $9,000 in sales. You ran a promot
vaieri [72.5K]

Answer: total net sales = $7950

Step-by-step explanation:

The formula for determining total net sales is expressed as

total net sales = Gross sales - (sales returns + allowances + discount)

Gross sales means total sales.

From the information given,

Gross sales = $9000

Discounts = $900

Returns = $150

Allowances = 0(this is because it was not given)

Therefore,

total net sales = 9000 - (900 + 150)

= 9000 - 1050

total net sales = $7950

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1 year ago
the area of the hartstein's kitchen is 182 square feet. this is 20% of the area of the first floor of their house. let f represe
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F=182/.8 should be the correct equation to use in this problem since your trying to find the remaining 80% left of the floor
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2 years ago
What is 6×9×(-5) equal to?
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6*9*(-5) = -270

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2 years ago
Sharon wants to make key chains with different colored beads. Each key chain will look the same. Sharon will use a total of 20 g
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20 green and 20 red ?
8 0
1 year ago
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At Monroe High School, 62% of all students participate in after school sports and 11% participate in both after school sports an
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Hey there!

Before you start solving anything, you need to identify which situation you want to call event A and which you want to call event B. I usually just do it in the order of the events as they're given to me in the question, so:

A = S<span>tudent participates in student council
B = S</span><span>tudent participates in after school sports

Any problems that contain the word "given" in the question portion will want you to refer to </span>P(A | B)<span> = P(</span>A ∩ B)/P(B). P(A | B) literally means "probability of event A, given that event B has occurred." P(A ∩ B) is the probability of event A and B happening, and P(B) is just the probability of event B happening. We've been given all of that, so:

P(A | B) = P(A ∩ B)/P(B)
P(A | B) = 11% / 62%
P(A | B) = 0.11 / 0.62
P(A | B) = 0.18

There will be about an 18% chance that <span>a student participates in student council, given that the student participates in after school sports. 

Hope this helped you out! :-)</span>
4 0
1 year ago
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