Matrix Question PLEASE

Answers

Answer 1

Answer: make into matrix
$\left[\begin{array}{ccc}2&1&1\n1&-3&-1\n4&5&2\end{array}\right] = \left[\begin{array}{ccc}-2\n14\n-4\end{array}\right]$

accoring to cramer's rule
replace the y collum with eh constant collumn and find the detterminant

$\left[\begin{array}{ccc}2&-2&1\n1&-14&-1\n4&-4&2\end{array}\right]$
det
$2 \left[\begin{array}{ccc}14&-1\n-4&2\end{array}\right]-(-2) \left[\begin{array}{ccc}1&-1\n4&2\end{array}\right]+1 \left[\begin{array}{ccc}1&14\n4&-4\end{array}\right]$
dunno wat fraction is

pick last option

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Solve -3/5y=-9What does y=?
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How many points of intersection are on the graph of the following system?lbrace y = x2 + 3x − 7y − x = 9The linear-quadratic system has (select)points of intersection.
Jessica wants to go on a school trip next month. The trip will cost $100 and she already has $10 and plans to babysit for $5 an hour to earn the rest of the money.A. Write an equation that could be used to determine h, the number of hours Jessica needs to babysit to earn $100.B. From your equation, determine the number of hours she needs to babysit.
Find the slope. ( include whether positive or negative.)

-x+8+3x=-6 hep me plz

Answers

Answer:

x = -7

Step-by-step explanation:

Move over all the numbers and variables to one side and equal them to zero. The equation should now look like this: -x+8+3x+6=0

Combine like terms! Add -x+3x to get 2x and add 8+6 to get 14.

The equation should now read: 2x+14=0

Subtract 14 from both sides to show: 2x = -14

Get x by itself! Divide both sides by 2 to get x = -7

Answer:

$x=-7$

Step-by-step explanation:

$-x+8+3x=-6$

$8+3x-x=-6$

$8+2x=-6$

$8+2x-8=-6-8$

$2x=-14$

$2x/2=-14/2$

$x=-7$

( 4,?)Is on the line y=2×+3. find the other half of the coordinate

Answers

(4, ?). Let ? = b

(4, b) on line y = 2x + 3

x =4, y = b.

y = 2x + 3

b = 2*4 + 3

b = 8 + 3

b = 11.

The other half of coordinate is 11.

You do y=2x(4)+3
that equals 11
so the coordinate is (4,11)

If the function h(x) represents the number of full hours that it takes a person to assemble x sets of tires in a factory, which would be an appropriate domain for the function?1) the set of real numbers
2) the set of negative integers
3) the set of integers
4) the set of non-negative integers

Why?

Answers

Of course the D answer is correct.
The number of sets of tires must be a whole number. It can't be real number because it is impossible to assemble for example 3.2321 set of tires.The negative -- it certainly also isn't possible. The amount can't be a negative number that's why C isn't correct as well.

How do you factor x squared plus 3x

Answers

$x^2 + 3x = x (x+3)$

factor the x out and you have x (x+3)

An experiment consists of tossing a coin and drawing a card, with the card-drawing stage dependent on the result of the coin toss. If heads occurs, then a card is selected at random from the clubs and spades suits. If tails occurs, then a card is selected at random from the hearts and diamonds suits. What is the size of the sample space of this two-stage experiment?

Answers

well .5 for coin toss and with 52 cards in deck and clubs and spades makes it 26 so its 1/26 then those are your probabilities.

Answer:th answer is 7

Step-by-step explanation:

the answer is 7

Is the inequality below sometimes, always, or never true?

-2(2x + 9) > -4x + 9

Answers

-2(2x + 9) > -4x + 9
-2(2x) - 2(9) > -4x + 9
-4x - 18 > -4x + 9
+ 4x + 4x
-18 > 9

It is never true.

Answer:

Never True

Step-by-step explanation: