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Ede4ka [16]
3 years ago
7

What is 2(5-3v)+9v=28?

Mathematics
2 answers:
almond37 [142]3 years ago
7 0
10-6v+9v=28
10+3v=28
-10 -10
3v=18
3 3
v=6
Softa [21]3 years ago
7 0
2(5 -3v)+9v=28 10-6v+9v=28 -6v+9v=28-10 3v=18 3v÷3=18÷3 V=6
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3 years ago
Help on #6 need to know now
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What is the estimated margin of error, using standard deviation?
OLEGan [10]
Find the mean ( average):
105 + 104 + 110 + 112 + 114 + 106 + 108 +109 = 868
Mean = 868 / 8 = 108.5

Standard deviation:
108.5 - 105 = 3.5, 3.5^2 = 12.25
108.5 - 104 = 4, 4^2 = 16
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114 - 108.5 = 5.5, 5.5^2 = 30.25
108.5 - 106 = 2.5, 2.5^2 = 6.25
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12.25 + 16 +2.25 + 12.25 + 30.25 +6.25+0.25+0.25 = 79.75
79.75/8 = 9.96875, SQRT(9.96875) = 3.1573

Standard Deviation = 3.1573

108.8 +/- 1.96 *(3.1573/sqrt(8) = 110.687 and 106.312

110.687 - 108.5 = 2.19
108.5 - 106.312 = 2.19
 

Margin of error = +/- 2.19



3 0
2 years ago
A whole number is represented by n. which statement is true about n and -n?
soldi70 [24.7K]

Answer: A and B

Explanation: A sum is an answer to an addition problem and a difference is the answer to a subtraction problem. N is the sum to the addition problem and -n is the answer to a subtraction problem.

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