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3 years ago

Very confused*** help

Mathematics

1 answer:

jeyben [28]3 years ago

7 0

First way of finding area is the usual formula.

Area of a rectangle = Length × Breadth

= 3x × x

= 3x^2

Second way of finding area of the bigger rectangle is adding both the rectangles' areas and subtracting by the area of the smaller rectangle.

Area of smaller rectangle:

Length × Breadth = 2 × x

= 2x

Area of bigger rectangle + Area of smaller rectangle = 3x^2 + 2x

Subtracting it by the area of the smaller rectangle:

3x^2 + 2x - 2x = 3x^2

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What is the answer, i need help

Yakvenalex [24]

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Convert the following systems of equations to an augmented matrix and use Gauss-Jordan reduction to convert to an equilivalent m

Rasek [7]

Answer:

System of equations:

$x_1+2x_2+2x_3=6\\2x_1+x_2+x_3=6\\x_1+x_2+3x_3=6$

Augmented matrix:

$\left[\begin{array}{cccc}1&2&2&6\\2&1&1&6\\1&1&3&6\end{array}\right]$

Reduced Row Echelon matrix:

$\left[\begin{array}{cccc}1&2&2&6\\0&1&1&2\\0&0&1&1\end{array}\right]$

Step-by-step explanation:

Convert the system into an augmented matrix:

$\left[\begin{array}{cccc}1&2&2&6\\2&1&1&6\\1&1&3&6\end{array}\right]$

For notation, R_n is the new nth row and r_n the unchanged one.

1. Operations:

$R_2=-2r_1+r_2\\R_3=-r_1+r_3$

Resulting matrix:

$\left[\begin{array}{cccc}1&2&2&6\\0&-3&-3&-6\\0&-1&1&0\end{array}\right]$

2. Operations:

$R_2=-\frac{1}{3}r_2$

Resulting matrix:

$\left[\begin{array}{cccc}1&2&2&6\\0&1&1&2\\0&-1&1&0\end{array}\right]$

3. Operations:

$R_3=r_2+r_3$

Resulting matrix:

$\left[\begin{array}{cccc}1&2&2&6\\0&1&1&2\\0&0&2&2\end{array}\right]$

4. Operations:

$R_3=\frac{1}{2}r_3$

Resulting matrix:

$\left[\begin{array}{cccc}1&2&2&6\\0&1&1&2\\0&0&1&1\end{array}\right]$

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3 years ago

This is the one I need help with please

Masteriza [31]

Let's add the percentage of the processing new books and repairing bindings.

6%+9%= 15%

We need to find how many times that goes into 44%

15%*3= 45

It is about 3 times more than she will spend processing new books and be repairing bindings.

I hope this helps!
~cupcake

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