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allochka39001 [22]
3 years ago
13

(

Mathematics
2 answers:
ankoles [38]3 years ago
8 0
A. A number line with an open circle on -4, shading to the left, and a closed circle on 3, shading to the right
jeka57 [31]3 years ago
8 0

we have the compound inequality

x-3 < -7 --------> inequality A

x < -7+3

x < -4

The solution inequality A is the interval-------> (-∞,-4)

A number line with an open circle on -4, shading to the left

x+5 \geq 8 --------> inequality B

x \geq 8-5

x \geq 3

The solution inequality B is the interval--------> [3,∞)

A number line with a closed circle on 3, shading to the right

so

The solution inequality A or inequality B is equal to  

Solution A +Solution B=(-∞,-4) + [3,∞)

therefore

<u>the answer is the option A</u>

A number line with an open circle on −4, shading to the left, and a closed circle on 3, shading to the right

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[10] In the following given system, determine a matrix A and vector b so that the system can be represented as a matrix equation
irina1246 [14]

Answer:

y=-\frac{158}{579}

Step-by-step explanation:

To find the matrix A, took all the numeric coefficient of the variables, the first column is for x, the second column for y, the third column for z and the last column for w:

A=\left[\begin{array}{cccc}1&1&2&2\\-7&-3&5&-8\\4&1&1&1\\3&7&-1&1\end{array}\right]

And the vector B is formed with the solution of each equation of the system:b=\left[\begin{array}{c}3\\-3\\6\\1\end{array}\right]

To apply the Cramer's rule, take the matrix A and replace the column assigned to the variable that you need to solve with the vector b, in this case, that would be the second column. This new matrix is going to be called A_{2}.

A_{2}=\left[\begin{array}{cccc}1&3&2&2\\-7&-3&5&-8\\4&6&1&1\\3&1&-1&1\end{array}\right]

The value of y using Cramer's rule is:

y=\frac{det(A_{2}) }{det(A)}

Find the value of the determinant of each matrix, and divide:

y==\frac{\left|\begin{array}{cccc}1&3&2&2\\-7&-3&5&-8\\4&6&1&1\\3&1&-1&1\end{array}\right|}{\left|\begin{array}{cccc}1&1&2&2\\-7&-3&5&-8\\4&1&1&1\\3&7&-1&1\end{array}\right|} =\frac{158}{-579}

y=-\frac{158}{579}

7 0
3 years ago
HELP due tomorrow morning at 7 30 help now please
olga55 [171]
1) 6/15 or 2/5
2) .4 or 40%

for the table its gonna be 14/32 or 7/16
then 5/17 then 11/25 then 8/29 then 3/14
then 9/31 then 12/32 or 3/8 then 8/30 or 4/15 then 2/19 then 15/32
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Lori has nine hours to spend this weekend working on a dozen art projects. If she splits her time evenly how long will she work
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Answer:

4 hours and 30 min every day

Step-by-step explanation:

2 days in weekend so 4 hour and 30 times two is 9 hours your welcome

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the answer is  2.316

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