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3 years ago

Find the inverse of the matrices if they Exist. Use the algorithm introduced in the section. [1 0 -2 -3 1 4 2 -3 4]

Mathematics

1 answer:

KiRa [710]3 years ago

6 0

Answer:

\frac{1}{2} \left[\begin{array}{ccc}16&6&2\\20&8&2\\7&3&1\end{array}\right]

Step-by-step explanation:

Given is a matrix 3x3 as

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

|A| =2 hence inverse exists.

Cofactors are 16 20 7

6 8 3

2 2 1

Hence inverse =

$\frac{1}{2} \left[\begin{array}{ccc}16&6&2\\20&8&2\\7&3&1\end{array}\right]$

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How to round to the nearest dollar add or subtract

Setler [38]

Okay Abrahammontiel1, the thing you must remember is any thing that is 5 or over must be rounded up and anything lower must be rounded down.
Example:
$2.30
since we want to round to the nearest dollar we look at the digit behind the whole dollar, which in this case is 0.3
and since it's lower that 0.5 we must round down
So it will look like this: $2

If we had a number like $4.72
we would look at the 0.7
and since it is greater that 0.5 we would round up so that it would equal $5

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3 years ago

on this american flag the width of the blue rectangle is 2/5 the width of the red and white stripes. What fraction of the area o

Gnesinka [82]

The area of the blue rectangle is 8/11 of the flag

The area of a shape is the amount of space it occupies

The width is given as:

$Width = \frac 25$

<h3>Blue region </h3>

The blue region of the American flag has a dimension of 8 by 11 stars.

So, we have:

$8 : 11 = x : \frac 25$

Where x represents the length of the blue region.

Express the ratio as fractions

$\frac{8 }{ 11} = x \div \frac 25$

Multiply both sides by 2/5

$\frac{8 }{ 11} \times \frac 52= x$

$\frac{20}{ 11} = x$

Rewrite as:

$x =\frac{20}{ 11}$

The area is then calculated as:

$Area =\frac{20}{ 11} \times \frac 25$

$Area =\frac{40}{ 55}$

Simplify

$Area =\frac{8}{ 11}$

Hence, the area of the blue rectangle is 8/11 of the flag

Read more about areas at:

brainly.com/question/14137384

3 0

3 years ago

The ordered pair (1, -5) is a solution for the system x + 2y = -9 and x - y = 6.<br> true <br> false

sweet [91]

In an ordered pair, x is the first number and y is the second number. So this is telling you x=1 and y=-5. You can take this information and plug it into the formulas.

x + 2y = -9
1 + 2(-5) = -9
1 + -10 = -9? True

x - y = 6
1 - -5 = 6? *
1 + 5 = 6? True.

(*Subtracting a negative makes it a positive.)

3 0

3 years ago

I-Ready

julsineya [31]

i have this exact screen and i dont know the answer

8 0

3 years ago

Find the measure of AB<br><br> A. 20<br> B. 21<br> C. 22<br> D. 14

Fed [463]

Answer:

$CB.CA=CD .CK$