Giải phương trình ma trận AX=B

A=[tex]\left[\begin{array}{ccc}1&2&3\\-2&-5&-3\\1&0&8\end{array}\right][/tex]
B=[tex]\left[\begin{array}{ccc}-4&2&7\\3&5&-1\\3&-4&2\end{array}\right][/tex]

Answer:

[tex]x = 26 \frac{1}{3} \\ [/tex]

[tex]y = 13 \frac{2}{3} \\ [/tex]

Step-by-step explanation:

x = 2y - 1

x - 2y = -1 ________(1)

x + y = 40________(2)

(2) - (1)

[tex]x + y - (x - 2y) = 40 - ( - 1) \\ x + y - x + 2y = 40 + 1 \\ 3y = 41 \\ y = \frac{41}{3} \\ y = 13 \frac{2}{3} \\ [/tex]

y = 13 2/3

[tex]x + y = 40 \\ x + 13 \frac{2}{3} = 40 \\ x = 40 - 13 \frac{2}{3} \\ x = 40 - \frac{41}{3} \\ x = \frac{3(40) - 41}{3} \\ x = \frac{120 - 41}{3} \\ x = \frac{79}{3} \\ x = 26 \frac{1}{3} \\ [/tex]

Answer:

brother

Step-by-step explanation:

Answer:

The choice;

[tex] - 1.45x - 3.41[/tex]

I hope I helped you^_^

Answer:

[tex]3.81x - 5.26x - 4.94 + 1.5 = \\ = - 1.45x - 3.41[/tex]

Answer:

1628

Step-by-step explanation:

Answer:

Either A or D. But I'd vote on A. Hope this helps! :)

Step-by-step explanation:

Answer:

False

Step-by-step explanation:

+32 is greater than -32

Answer:

false it is less than

Step-by-step explanation:

-32<+32

The equation is y = 0.60x. Then the total cost of 9 lbs of bananas will be 5.4 lbs.

A ratio is a group of sequentially ordered numbers a and b expressed as a/b, where b is never equal to zero. When two objects are equal, a statement is said to be proportional.

The cost of bananas, y, is directly proportional to x, the pounds of bananas purchased. Then the relationship is given as,

y ∝ x

y = kx

Then the relationship between 'x' and 'y' will be linear.  If 2.5 lbs of bananas cost $1.50. Then we have

1.50 = k (2.5)

k = 0.60  

Then the equation is given as,

y = 0.60 x

Then the total cost of 9 lbs of bananas will be given as,

y = 0.60 (9)

y = 5.4 lbs

The equation is y = 0.60x. Then the total cost of 9 lbs of bananas will be 5.4 lbs.

More about the ratio and the proportion link is given below.

https://brainly.com/question/14335762

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Answer:

c

Step-by-step explanation:

Answer:

1.75oz

Step-by-step explanation:

The question says "What is the difference in weight

between the standard size and snack pack?" The word "difference" symbolizes a subtraction problem. Our problem is 5oz - 3.25oz which equals 1.75oz.

Hope this helped!

Answer: 5h+9

Step-by-step explanation:

10h + (-5h)

5h+(6(+3))

9514 1404 393

Answer:

  √40 ≈ 6 4/13 ≈ 6.31

Step-by-step explanation:

The estimate by linear approximation starts with the recognition that ...

  40 = 36 +4 = 6² +4

and the difference from 36 to the next square, 7² = 49 is 49-36 = 13.

The linear approximation to √40 is ...

  √40 ≈ 6 4/13 ≈ 6.31

__

There are various methods for improving this approximation. Perhaps the fastest improvement is obtained using the "Babylonian method." The next iteration is the average of this value and 40 divided by this value.

  (82/13 +40/(82/13))/2 = 6 173/533 ≈ 6.3246 . . . . accurate to 4 decimal places

_____

Additional comment

When you write the value in terms of a square and a remainder:

  n = s² +r

then the above linear approximation of √n can be written as ...

  √n ≈ s +r/(2s+1)

Using the idea that a square root can always be represented by a continued fraction, we can continue the fraction one more iteration to give a slightly better approximation:

  √n ≈ s +r(2s+1)/(2s(2s+1) +r)

For the case at hand, this gives √40 ≈ 6+52/160 = 6 13/40 = 6.325, accurate to 3 decimal places. Additional iterations using the continued fraction idea can be had using ...

  n'' = s + r/(s +n') . . . . . where n' is an approximation of the root and n'' is a better approximation. This does not converge as fast as the Babylonian method, but may be easier to calculate on some calculators.

Answer:

I think it is 4/25...?

Step-by-step explanation:

Answer:

[tex]5r + 4d = 32[/tex]

[tex]r + 6d = 22[/tex]

the value of roses is 4 dollars a pieces and that of daisies is 3 bucks a piece

Step-by-step explanation:

for part a just denote r for roses and rerecord the question in terms of a function of roses and daisies the right hand side should be the prices or cost

solve the two equations simultaneously or by substitution.

let's do simultaneous

multiply the secondequation by 5

[tex]5r + 4d = 32[/tex]

[tex]5r + 30d = 110[/tex]

subtracting the two,

[tex]26d = 78[/tex]

therefore

[tex]d = 3 dollars[/tex]

find the value of roses,

[tex]5r + 4(3) = 32 \\ 5r = 32 - 12 \\ r = 4[/tex]

Answer:

5:6

Step-by-step explanation:

when adding the two probabilities together, they should equal 6:6. So, 5:6 is the odds of winning.

The probability is the ratio of the favorable event to the total number of events. Then the probability that Bucksnot will win the race is 5/6.

Probability means possibility. It deals with the occurrence of a random event. The value of probability can only be from 0 to 1. Its basic meaning is something is likely to happen.

The odds against the horse Bucksnot winning the race are 1:6.

Then the probability that Bucksnot will win the race will be

[tex]\rm P = 1 - \dfrac{1}{6}\\\\P = \dfrac{5}{6}[/tex]

More about the probability link is given below.

https://brainly.com/question/795909

#SPJ2

Answer:

$158,035.41 rounded to the nearest 10 dollars is $158,040

Step-by-step explanation:

Look to the next smallest place value, the digit to the right of the place value you're rounding to. For example, if you want to round to the nearest ten you'd look at the ones place. If the digit in the next smallest place value is less than five (0, 1, 2, 3, or 4), you leave the digit you want to round to as-is.

Please allow me to know if this helped you clicking thank you or rating.  

Miss Hawaii

Step-by-step explanation:

the inverse function simply calculate the original x it of a given y. so, we need to transform the original function to calculate x instead of y.

and then, at the end to make it a formally correct function definition, we rename x to y and y to x.

y = x + 3

x = y - 3

=> to make it a formally correct function definition

y = x - 3 = h(x)

Answer:

24

Step-by-step explanation:

15+9=24

Answer:

Its easier to do it on a number line but I'm going to give you the straight answer when you count from negatives to positives you go left to right -15, -14, -13, -12, -11, -10, -9, -8, -7, -6, -5, -4, -3, -2, -1 and then always have the 0 so 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 It would be 25

Answer:

26/3 as a mixed number is 8 2/3

Step-by-step explanation:

hope this helped you if it did plz mark brainiest

Answer:c

Step-by-step explanation:i did it

Step-by-step explanation:

9. a)

2•(-2) = 2 - 6

-4 = -4

-2 -2 = -2•2

-4 = -4

Yes, the ordered pair is the solution

9. b)

-1 = 3•(-2) +5

-1 = -6 +5

-1 = -1

3•(-2) +(-1) = -2

-6 -1 = -2

-7 ≠ -2

No, the ordered pair is not the solution

10. (-1, -1) and (3, -1)

11.

y = 6 +x

Now substitute it in the first equation:

3•(6 +x) = 5x

18 + 3x = 5x

18 = 2x

x = 18/2

x = 9

Now, substitute x = 9 in the second equation:

y -9 = 6

y = 6 +9

y = 15

Answer:

2 - 3 + 15 = 14

Step-by-step explanation:

Answer:

Exact form = 476/135

Decimal form = 3.5259

Mixed Number form = 3 71/135

Step-by-step explanation:

Reduce the expression, if possible, by cancelling the common factors.

Hope this helps. Please mark as brainlist

Answer: 2 3/8

I got an A

Answer:

2 + 3/8

Step-by-step explanation:

Therefore we get 19 / 8 = 2 + 3/8 , which is written as 2 3/8 , called a mixed number. To convert 19/8 you do division; 8 into 19 goes 2 times with 3 left over; so 2 3/8.

Answer:

Occupation -> a job or profession: his prime occupation was as editor.

• a way of spending time: a game of cards is a pretty harmless occupation.

2 the action, state, or period of occupying or being occupied by military force: the Roman occupation of Britain | the Nazi occupation.

• the action of entering and taking control of a building: the workers remained in occupation until October 16.

3 the action or fact of living in or using a building or other place: a property suitable for occupation by older people.

Step-by-step explanation:

hope it helps

Answer:

It is a job or profession

Step-by-step explanation:

If you have an occupation then that means you have a job.

Hope this helps!

Answer:

18.6

Step-by-step explanation:

[tex] \frac{ - 18.6}{ - 1} = 18.6[/tex]

please mark this answer as brainlist

Answer:

30.5x" (15+10

A

D

O A. 13

Step-by-step explanation: