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sergejj [24]
3 years ago
11

A student is trying to solve the system of two equations given below:

Mathematics
1 answer:
natima [27]3 years ago
5 0
If you are going to eliminate the y term the y must be the same value but different signs

since the second equation has y, a value of 3 you mist make the first one -3 so you will multiply the whole equation by -3
c is the answer
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Step-by-step explanation:

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3 years ago
PLEASE HELP! (WILL GIVE BRAINILEST ANSWER)
RoseWind [281]
A) we know, all the angles in a triangle is equal to 180
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87 + 3x + 6 = 180
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5 0
4 years ago
in an examination, 40% students passed in maths only, 30% passed in science only and 10% students failed in both subjects. if 20
arsen [322]

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4 0
3 years ago
The standard deviation of test scores on a certain achievement test is 11.3. If a randomsample of 81 students had a sample mean
Svetradugi [14.3K]

Answer: (72.535, 76.665)

Step-by-step explanation:

The confidence interval for population mean is given by :-

\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}

, where \sigma = population standard deviation.

n= Sample size

\overline{x} = sample mean.

z^* = Critical z-value (two-tailed)

Given : \sigma=11.3

n= 81

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The critical values for 90% confidence interval : z^*=\pm1.645

Now, the confidence interval for population mean would be :

74.6\pm (1.645)\dfrac{11.3}{\sqrt{81}}\\\\=74.6\pm(1.645)(\dfrac{11.3}{9})\approx74.6\pm2.065\\\\=(74.6-2.065,\ 74.6+2.065)\\\\=(72.535,\ 76.665)

Hence, a 90 percent confidence interval estimatefor the average score of all students. : (72.535, 76.665)

8 0
3 years ago
Which is the same as moving the decimal point 3 places to the right in a decimal number
BlackZzzverrR [31]

Answer:

Moving the decimal 3 places to the right in a decimal number is the same as multiplying the number by 1000.

8 0
3 years ago
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