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olchik [2.2K]
3 years ago
10

I need to find the y 7x-4y=-6

Mathematics
2 answers:
Sliva [168]3 years ago
7 0

Answer:

Y=-1.5-1.75x

Step-by-step explanation:

satela [25.4K]3 years ago
4 0

Answer:

y=(6+7x)/4

Step-by-step explanation:

7x-4y=-6

-4y=-6-7x

y=(-6-7x)/-4

y=(6+7x)/4

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Exhibit B In order to determine whether or not there is a significant difference between the hourly wages of two companies, two
ser-zykov [4K]

Answer: c. 3.01

Step-by-step explanation:

The test statistic for difference between two population mean (when population standard deviation is known) is given by :

z=\dfrac{\overline{x}_1-\overline{x}_2}{\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}}

, where n_1 = Size of first sample

n_2 = Size of second sample

\overline{x}_1-\overline{x}_2 = Difference between two sample mean.

\sigma_1 = standard deviation for population 1.

\sigma_2 = standard deviation for population 2.

As per given , we have

n_1=80

n_2=60

\overline{x}_1=\$6.75

\overline{x}_2=\$6.25

\sigma_1=\$1

\sigma_2=\$0.95

Substitute these values in formula , we get

z=\dfrac{6.75-6.25}{\sqrt{\dfrac{(1)^2}{80}+\dfrac{(0.95)^2}{60}}}

z=\dfrac{0.50}{\sqrt{0.0275416666667}}

z=\dfrac{0.50}{0.165956821694}

z=3.0128318613\approx3.01

Hence, the value of the test statistic is <u>3.01</u>.

Hence, the correct option is c. 3.01 .

7 0
3 years ago
Stan is a running back on the local football team. During the last game, Stan carried the ball on back-to-back plays. The first
Lelechka [254]
Stan's net yardage was
  +32 -6 = 26 . . . . yards
5 0
4 years ago
Read 2 more answers
Could someone pleaseeeeee help me with my math! Thank you &lt;3
Papessa [141]
1 7/9-2/9=1 5/9

Hope this helps:)
8 0
3 years ago
The graph shows the result of a matrix transformation, where the pre-image has dashed lines Which matrix operation is represente
diamong [38]

The <em>matrix operation</em> is the <em>addition subtraction </em>and <em>multiplication </em>involving matrices.  The coordinates of the <em>image </em>can be represented as a matrix obtained from the coordinates of the <em>preimage </em>through matrix operations

The best correct option is<u> option D)</u>,<em> (the y-coordinate for the point (8, -7) is to be replaced with a 7 to give (7, -7) as follows</em>:

\left[\begin{array}{rrrr}1&0\\0&-1\end{array}\right] \left[\begin{array}{rrrr}9&7&3&2\\-3&-7&-7&-5\end{array}\right]

The reason the above matrix value for the matrix operation are correct are as follows:

Known parameters:

From the diagram, we have that the <em>coordinates</em> of the vertices of the preimage are;

(2, -5), (3, -7), (9, -3), and (7, -7)

The <em>coordinates </em>of the vertices of the image are;

(2, 5), (3, 7), (9, 3), and (7, 7)

Required:

The matrix operation for the transformation of the preimage points to the image points

Solution:

The transformation from the coordinates of the vertices of primage to the  vertices of image involves the change in the sign from negative to positive, of the y-values of the image, which can be obtained by <em>multiplying by</em> (-1)

Therefore, the required matrix operation is presented as follows:

\mathbf{\left[\begin{array}{rrrr}1&0\\0&-1\end{array}\right] \left[\begin{array}{rrrr}9&7&3&2\\-3&-7&-7&-5\end{array}\right]} =\left[\begin{array}{rrrr}9&7&3&2\\3&7&7&5\end{array}\right]

Therefore, the <em>best correct</em> option is option D)

Learn more about matrix operations here:

brainly.com/question/17141646

3 0
3 years ago
A bank paid 2.3% interest on a money market account. What is 2.3% written as a decimal
DochEvi [55]
1\%\ \ \rightarrow\ \  \frac{1}{100}=0.01 \\\\2.3\%\ \ \rightarrow\ \ x\\\\x= \frac{2.3\%\cdot0.01}{1\%} \ \ \ \Rightarrow\ \ \ x=0.023
7 0
3 years ago
Read 2 more answers
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