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Luba_88 [7]
3 years ago
13

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid to obtain a mixture containing a

40% solution of acid?
Mathematics
2 answers:
anygoal [31]3 years ago
8 0

Answer:

x=40

Step-by-step explanation:

0.50x + 20(0.20) = 0.40(x + 20)

0.5x+4=0.4x+8

0.1x+4=8

0.1x=4

x=40

ollegr [7]3 years ago
7 0

Answer:

40

Step-by-step explanation:

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VMariaS [17]

Answer:

B. -3.25

Step-by-step explanation:

Multiplying by 0.5 is the same as divided by 2.

*Dont forget the negative.

-0.5(6.5)= 6.5/-2 = -3.25

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3 years ago
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Leno4ka [110]
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5 0
2 years ago
1. Calculate the variance of the set of data to two decimal places.
Komok [63]
<h3>Answer:  3.14 (choice C)</h3>

============================================================

Explanation:

First we need the arithmetic mean

Add up the values to get 1+2+4+4+5+6+6 = 28

Divide this over the number of values (n = 7) to get 28/n = 28/7 = 4

The mean is 4.

Next, we subtract the mean from each data value and square the difference

  • (1-4)^2 = 9
  • (2-4)^2 = 4
  • (4-4)^2 = 0
  • (4-4)^2 = 0
  • (5-4)^2 = 1
  • (6-4)^2 = 4
  • (6-4)^2 = 4

Add up those results: 9+4+0+0+1+4+4 = 22

Lastly, we divide over the number of items (n = 7) to get the population variance: 22/n = 22/7 = 3.14 approximately

----------

Side note:

If you wanted the sample variance, then you divide over n-1 = 7-1 = 6

22/(n-1) = 22/6 = 3.67 is the approximate sample variance

7 0
3 years ago
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