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Zinaida [17]
2 years ago
12

Which step is not necessary when solving this system of equations by graphing? 3x-y=4 x+y= -4

Mathematics
2 answers:
puteri [66]2 years ago
6 0

Answer:

determine the shaded area for each line

Step-by-step explanation:

its not need

lions [1.4K]2 years ago
3 0

Answer: The answer is C: determine the shaded area for each line.

Just took the test on Edg.

Step-by-step explanation:

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Find f(3) if f(x) = -4x^2+5x
maksim [4K]
<span>f(-3) = 4 + 3 + 9 f(-3) = 16 tell me if that is it  </span>
5 0
3 years ago
Read 2 more answers
In Applied Life Data Analysis (Wiley, 1982), Wayne Nelson presents the breakdown time of an insulating fluid between electrodes
ale4655 [162]

Answer:

The sample mean is \bar{x}=14.371 min.

The sample standard deviation is \sigma = 18.889 min.

Step-by-step explanation:

We have the following data set:

\begin{array}{cccccccc}0.15&0.82&0.81&1.44&2.70&3.28&4.00&4.70\\4.96&6.49&7.25&8.03&8.40&12.15&31.89&32.47\\33.79&36.80&72.92&&&&&\end{array}

The mean of a data set is commonly known as the average. You find the mean by taking the sum of all the data values and dividing that sum by the total number of data values.

The formula for the mean of a sample is

\bar{x} = \frac{{\sum}x}{n}

where, n is the number of values in the data set.

\bar{x}=\frac{0.15+0.82+0.81+1.44+2.7+3.28+4+4.7+4.96+6.49+7.25+8.03+8.4+12.15+31.89+32.47+33.79+36.80+72.92}{19}\\\\\bar{x}=14.371

The standard deviation measures how close the set of data is to the mean value of the data set. If data set have high standard deviation than the values are spread out very much. If data set have small standard deviation the data points are very close to the mean.

To find standard deviation we use the following formula

\sigma = \sqrt{ \frac{ \sum{\left(x_i - \overline{x}\right)^2 }}{n-1} }

The mean of a sample is  \bar{x}=14.371.

Create the below table.

Find the sum of numbers in the last column to get.

\sum{\left(x_i - \overline{X}\right)^2} = 6422.0982

\sigma = \sqrt{ \frac{ \sum{\left(x_i - \overline{x}\right)^2 }}{n-1} }       = \sqrt{ \frac{ 6422.0982 }{ 19 - 1} } \approx 18.889

7 0
3 years ago
4 times the measure of the complement of an angle is equal to 2/3he measure of the original angle's supplement. what is the meas
Andrej [43]
Let x be the angle
Complement of x is (90 degrees-x)
Supplement of x is (180 degrees-x)

4•(90-x)= 2/3(180-x)
3•4(90-x)=2(180-x)
1080-12x=360-2x
1080-360=12x-2x
720=10x
720/10= x
So x = 72 degrees
3 0
3 years ago
HELP PLEASE!!!!!!!!!!!
sashaice [31]
The simplified expression should be 3/7
3 0
3 years ago
Can somebody help I will mark brainlist if correct !! :) and show work pls
alekssr [168]

Answer:24

Step-by-step explanation:If you look at the multiples of 8 there are: 8,16,24,32,,40,and so on.If we look at the multiples of 6 there are:6,12,18,24,30 and so on.Now if we look at all the multiples the closest multiple is 24 so 24 would be our answer.

5 0
2 years ago
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