Mark is solving the following system.

X+y+Z= 2(1)

3x+2y+z=8 (2)

4x-y-Tz= 16 (3)



Step 1: He multiplies equation (1) by 7 and adds it to equation (3). Step 2: He multiplies equation (3) by 2 and adds it to equation (2)

Which statement explains Mark's mistake?​

Answers

Answer 1

Answer:

the answer is c

Step-by-step explanation:

i just finished the quiz

Answer 2

He did not eliminate the same variables in steps 1 and 2


Related Questions

what is the property

3 * 1/3 =1

Answers

Answer:

1/3 = 3

Step-by-step explanation:

3* 1/3 = 1

1/3 = 1 (3)

1/3 = 3

What is 4/9x - 3 > 7/3
SHOW WORK PLEASE!!
btw i'm gonna be asking a lot of questions for this halloween thing we have to do in math.

Answers

Answer:

[tex]x >12[/tex]

[tex](12, \infty)[/tex]

[tex]\{x\in\mathbb{R} : x>12 \}[/tex]

Step-by-step explanation:

[tex]\dfrac{4}{9} x - 3 > \dfrac{7}{3}[/tex]

[tex]\dfrac{4}{9} x > \dfrac{7}{3}+3[/tex]

Multiply both sides by 9

[tex]4 x > 21+27[/tex]

[tex]4 x > 48[/tex]

Divide both sides by 4

[tex]x >12[/tex]

Maria and Emma each have movie DVD collections.

The number of DVD's in Maria's collection can be represented by x
The number of DVD's in Emma's collection is 3 times the number in Maria's collection.
The total number of DVD's in both collections is 144


What is x the total number of DVD's in Maria's collection?




A=108


B=48

C=72


D=36

Answers

Answer:

D = 36

Step-by-step explanation:

x = Number of DVDs in Maria's collection

So, number of DVDs Emma has is 3x

Given,

x+3x=144

4x=144

x=144/4 = 36

What is the domain of the relation below? A. {-1,0, 1, 3} B. {-2,0, 1, 3) C. -2,-1,0, 1, 2, 3} D. {0, 1, 2, 3)​

Answers

Answer:

C

Step-by-step explanation:

Find the distance between point G and point H.

Answers

Answer:

(7,0) is your answer

Step-by-step explanation:

count 7 over for x then bc y isn't increasing or decreasing its 0

Me ayudan con esto porfavor es para hoy

Answers

Perdon yo te ayudo pero no se que es

Answer:

Lo siento, no puedo ayudarte, ya es debido

Evaluar expresiones

Answers

10. 19
11. 40
12. 30
13. 13
14. 31
15. 63
16. 18
17. 60
18. 32
19. 70
20. 227
21. 20

What is the lowest value of the range of the function shown on the graph

Answers

-2
But check it and see cuz that’s the lowest but -3 is also low

what is the independent variable in this example HURRY PLEASE

Answers

Answer:

Volume

Step-by-step explanation:

x axis is always independant y axis is always dependant

Kennith and three of his friends shared a basket of apples. The basket weighed 14.75 pounds. What is the weight of the apples that each of them recieved

Answers

Answer:

3.6875 lbs per person

Step-by-step explanation:

Calculation for the weight of the apples that each of them recieved

Based on the information given we were told that Kenneth shared the basket of apples with 3 of his friends which means that they are 4 in total which is Kenneth + 3 of his friends.

Hence,

Weight of apples=14.75 pound/4

Weight of apples=3.6875 lbs per person

Therefore the weight of the apples that each of them received will be 3.6875 lbs per person

Which number equals 9 cross times 100 plus 9 cross times 10 plus 0 cross times 1 plus 0 cross times 1 over 10 plus 3 cross times 1 over 100 plus 7 cross times fraction numerator 1 over denominator 1 comma 000 end fraction ?

Answers

Answer:

Step-by-step explanation:

(9x100)+(9x10)+(0x1)

EMERGENCY! Please give me the correct answer!​

Answers

Answer:

Its the one all the way to the right.

Step-by-step explanation:

Apple announced that the new iphone 12 is coming out soon. Best Buy has reduced the price of a iphone 11 from $500 to $300. By what percent was the price of the iphone 11 reduced

Answers

Answer:

40%

Step-by-step explanation:

Answer:

40%

Step-by-step explanation:

Which term can be added to both sides of the equation
by completing the square?
+
a
a so that the equation can be solved
2
O
2a
O
ca.
Help please

Answers

Step-by-step explanation:

my instagram account bdq.frk follow please

(7m+3)+(7m+6)
I really need help with this

Answers

Answer:

Step-by-step explanation:

The parenthesis can cancel because the lack of anything you can do in them, so that will leave you with 7m + 3 + 7m + 6

Next step is to add like numbers, you should start by adding 7m + 7m, which would be 14m.

Next would be to add 3 + 6, which is nine.

To end this equation, simply put 14m + 9

There is no one-number answer because we do not know what m is. So the equation 14m + 9 is the final answer.

If you know this please help me

Answers

Answer:

12 weeks

Explanation:

499-220=279

279/25= 11.16

Simplificar: 8x + 2x - y

Answers

Answer:

= 10x - y

Step-by-step explanation:

Someone help me with 12 pls plsssss plsssss

Answers

Answer:

Equation is 7n-9, a10=61

Step-by-step explanation:

nth term of an arithmetic sequence with first term a and common difference d is a+(n-1)d

Here, a=-2 , d=7

nth term is -2+(n-1)7=7n-9

a10=7*10-9=70-9=61

Whats the midpoint between 1 and 2

Answers

Answer:

1.5

Step-by-step explanation:

Think of a number line, on the number line are the points 1 and 2, the number between those points is the midpoint.

You can also average 1 and 2 to get the midpoint. To average any number sequence, simply add all of the numbers and then divide the sum of those numbers by the amount of numbers there are.

In this case add 1 and 2 to get 3 then divide 3 by 2 (because there are two numbers) to get 1.5

The midpoint between 1 and 2 is 1.5.

What is the midpoint?

A location that is halfway between two other points is considered to be a line segment's midway. The distance between the midway and each endpoint is the same.

Given points are 1 and 2. The midpoint is calculated by using the formula as ( x₁ + x₂ ) / 2.

Average 1 and 2 to get the midpoint. To average any number sequence, simply add all of the numbers and then divide the sum of those numbers by the number of numbers there are.

The midpoint will be calculated as:-

M = ( x₁ + x₂ ) / 2.

M = ( 1 + 2 ) / 2.

M = ( 3 ) / 2.

M = 1.5

Therefore, the midpoint between 1 and 2 is 1.5.

To know more about midpoint follow

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If a || b and e | f, what is the value of x?
a
b
(x - 3)
X=

Answers

The value of it will be (x -3)

IS this bounded above or below

Answers

Answer:

D:The function is bounded both above and below

Step-by-step explanation:

I'm not 100% sure but I'm about 90% sure

When a certain number is divided by 8, the quotient is 13. What is the number? Let m = the number.

Answers

Answer:

M=104

Step-by-step explanation:

8 times 13 equals 104. Therefore is you divide by 8, you get 13 and vice versa

Claire earns $50 per week. How long would she need to wor
earned $1757

Answers

1757divided 50 is the answer

Answer:36 weeks

Step-by-step explanation:

1757/50=35.1

A game advertises, EVERYONE IS A WINNER! It costs $4 to play. You get to choose a card from a standard deck of 52 playing cards. If you choose a red card, you win $5. If you choose a black card, you get $2. What is the expected value of playing this game?

Answers

What are the answer choices

What is the value of x in the following equation?
2/3x+2=4​

Answers

Answer: 3

Step-by-step explanation: Subtract 2 from both sides, leaving 2/3x=2. All you need to do now is find a number to multiply 2 by to get 6/3, which would be 3. 2=2 is a true statement.

The value of x in the equation (2/3)x + 2 = 4 is x = 3.

We have,

To solve the equation (2/3)x + 2 = 4, we can follow these steps:

- Start by subtracting 2 from both sides of the equation to isolate the term with x:

(2/3)x + 2 - 2 = 4 - 2

(2/3)x = 2

- To get rid of the fraction, multiply both sides of the equation by the reciprocal of (2/3), which is 3/2:

3/2 (2/3)x = 3/2 x 2

x = 3

Therefore,

The value of x in the equation (2/3)x + 2 = 4 is x = 3.

Learn more about equations here:

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What is the solution to this equation?
-6x + 3 = 21

Answers

Answer:

x=(-3)

Step-by-step explanation:

-6x(-3) is 18

18+3=21

Answer: -3

Step-by-step explanation:

Move all terms that don't contain

x to the right side and solve.

x = −3

PLS GIVE ME BRAINLIEST, IT WILL MEAN A LOT TO ME

A particular computer takes 13-minutes to download a 52-minute TV show. How long will it take the computer to download a 2.5-hour ​movie?

Answers

Answer:  37.5 minutes

Step-by-step explanation:

1. divide 52 by 13

52/13 = 4

2. take divide 150 (minutes in 2.5 hours) by 4

150/4 = 37.5

your answer is 37.5 minutes

Helppp plzzzzzzzzzzsnnsnsns

Answers

Answer:

Step-by-step explanation:

independent is X

dependent is Y

domain is 0 to 3  

range is 4.75 to 7  

:)

A train travels 90 miles in 1.5 hours. How many miles will the train go in 6 hours if it continues to travel at the same rate of speed?

Answers

Answer:

360

Step-by-step explanation:

the train is going 60 mph. 60*6=360

An aquarium is being drained. The amount of water in the aquarium, in liters, can be determined by using the function w(x) = 20 - 10 The variable x is the number of seconds after the drain plug is removed. Select EACH true statement about the scenario. The function is a linear equation. The y-intercept of 20 is the initial amount of payater in the aquarium. The slope represents how fast the water is being drained.​

Answers

Answer:

The answer is all three

Step-by-step explanation:

The function that represents the draining of the aquarium is an illustration of a linear function.

All statements are true about the scenario.

The function is given as:

[tex]\mathbf{w(x) = 20 - 10x}[/tex]

A linear function is represented as:

[tex]\mathbf{y =mx + c}[/tex]

m represents slopec represents the y-intercept

By comparing [tex]\mathbf{y =mx + c}[/tex] and [tex]\mathbf{w(x) = 20 - 10x}[/tex], we can conclude that:

[tex]\mathbf{w(x) = 20 - 10x}[/tex] is a linear equation

The slope of a function is the average rate of a function.

The slope of [tex]\mathbf{w(x) = 20 - 10x}[/tex] is 10

This means that, the aquarium is being drained at a rate of 10 liters per second.

So, we can conclude that, the following statement is also true.

The slope represents how fast the water is being drained.​

Lastly, when x = 0, we have:

[tex]\mathbf{w(0) = 20 - 10(0) = 20}[/tex]

This represents the initial volume of the aquarium.

So, we can conclude that, the following statement is also true.

The y-intercept of 20 is the initial amount of water in the aquarium

Hence, the three statements are true.

Read more about linear functions at:

https://brainly.com/question/20286983

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