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Arturiano [62]
3 years ago
10

Eight values have a mean of 7. a ninth value is added. the new mean is 9. what is the new value

Mathematics
1 answer:
My name is Ann [436]3 years ago
4 0

Answer:

25 because the 8 values must times with 7 and will get 56. when the ninth value added , let the ninth value as y , 56+y , the new mean is 9 . so it will be like this , 56+y over 9 times with 9

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4 0
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Solve for x: 4 = (–8) +3x show your work
Triss [41]
4 = (-8) + 3x

Firstly, you can rearrange the equation to make it easier to read:
3x - 8 = 4

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6 0
3 years ago
Which of the following shows that polynomials are closed under subtraction when polynomial x + 5 is subtracted from 3x2 + 2x − 6
Art [367]
For this case we have the following polynomials:
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Q = x + 5
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 P - Q = (3x ^ 2 + 2x - 6) - (x + 5)

 What we must do is subtract terms of the same degree.
 We have then:
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3x ^ 2 + x - 11 will be a polynomial
3 0
3 years ago
-9+b=3.5 what is the value of b?
Serggg [28]

Answer:

12.5

Step-by-step explanation:

In order to solve, we need to add 9 to both sides of the equation:

<u>Our sum applied:</u>

b=12.5

4 0
2 years ago
spencer took 21$ with him to the mall. At the music store, he spent 2/3 of his money on a DVD, he spent 1/4 of what he had left
Sunny_sXe [5.5K]

Answer:

$5.25 Dollars

Step-by-step explanation:

I know that if you divide 21 by 3 you get 7. So, 2/3 of 21 is 14. He spent 14 dollars at the music store. This means that he has 7 dollars left. From here he spend 1/4 of 7 dollars on a drink. 1/4 of 7 is $1.75. This means that he has 5.25 dollars left after he bought the drink! :)

<em>Hope this helped! :)</em>

6 0
3 years ago
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