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dexar [7]
3 years ago
9

Will someone please help solve this problem

Mathematics
1 answer:
andreyandreev [35.5K]3 years ago
5 0

The answer is $12.50 per cd .

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Use Gauss-Jordan elimination to solve the following linear system.
marysya [2.9K]
Just put the coefients in to a matrix

1x-6y-3z=4
-2x+0y-3z=-8
-2x+2y-3z=-14

\left[\begin{array}{ccc}1&-6&-3|4\\-2&0&-3|-8\\-2&2&-3|-14\end{array}\right]
mulstiply 2nd row by -1 and add to 3rd
\left[\begin{array}{ccc}1&-6&-3|4\\-2&0&-3|-8\\0&2&0|-6\end{array}\right]
divde last row by 2
\left[\begin{array}{ccc}1&-6&-3|4\\-2&0&-3|-8\\0&1&0|-3\end{array}\right]
multiply 2rd row by 6 and add to top one
\left[\begin{array}{ccc}1&0&-3|-14\\-2&0&-3|-8\\0&1&0|-3\end{array}\right]
multiply 1st row by -1 and add to 2nd
\left[\begin{array}{ccc}1&0&-3|-14\\-3&0&0|6\\0&1&0|-3\end{array}\right]
divide 2nd row by -3
\left[\begin{array}{ccc}1&0&-3|-14\\1&0&0|-2\\0&1&0|-3\end{array}\right]
mulstiply 2nd row by -1 and add to 1st row
\left[\begin{array}{ccc}0&0&-3|-12\\1&0&0|-2\\0&1&0|-3\end{array}\right]
divide 1st row by -3
\left[\begin{array}{ccc}0&0&1|4\\1&0&0|-2\\0&1&0|-3\end{array}\right]

rerange
\left[\begin{array}{ccc}1&0&0|-2\\0&1&0|-3\\0&0&1| 4\end{array}\right]

x=-2
y=-3
z=4
(x,y,z)
(-2,-3,4)

B is answer
7 0
3 years ago
1. (3x + 7) + (8x + 2)
Mashutka [201]
11x+9


Step by step:
Remove the parenthesis
3x+7+8x+2
Collect like terms
11x+7+2
Add 7+2
11x+9
5 0
3 years ago
There's 40 students on the team 22 are girl what percent are boys
Klio2033 [76]

Answer:

45% are boys

Step-by-step explanation:

because 18/40 = 45%

7 0
2 years ago
Drag each statement to the correct category. Classify the sentences based on whether they are or are not statements. Prime numbe
Archy [21]

Answer:

1. Prime numbers are easier to count. (Not a statement)

2.Irrational numbers can be written as fractions. (Statement)

3. Natural numbers can be negative. (Statement)

4.  Addition is the simplest mathematical operation. (Not a Statement)

5. Equilateral triangles are quicker to construct than scalene triangles. (Not a statement)

6. The set of real numbers is infinite. (Statement)

i hope it will help you!

6 0
3 years ago
Tash 3 write the Following in expanded form then in word form. 1. 355,645​
Karolina [17]

Answer:

u will get a option like this when u put ur question then u can add photos!!

5 0
3 years ago
Read 2 more answers
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