Solve the following system equations:
2x + 4y – 3z = –7
3x + y + 4z = –12
x + 3y + 4z = 4

POSIBBLE ANSWERS:

(–6, 2, 1)

(6, 2, 1)

(6, –2, –1)

(–6, –2, –1)
...?

Answers

Answer 1
(1).. 2x + 4y - 3z = -7 
(2).. 3x + 1y + 4z = -12 
(3).. 1x + 3y + 4z = 4 

****************** 
ok.. we're going to put this into matrix form.. where we drop x, y, and z 
2.. 4.. -3.. | ... -7 
3.. 1.. .4.. | ... -12 
1.. 3.. .4 . | ... 4 
ok? 

now.. I'll designate the rows (1), (2), (3).. ok? 
new (1) = -2x(3) + (1) 
new (2) = -3x(3) + (2) 
ie... 
0..-2..-11. | .. -15 
0..-8.. -8.. | ... -24 
1.. 3.. .4 . | ... .+4 

new row (2) = old (2) / -8 
0..-2..-11. | .. -15 
0.. 1.. 1.. | ... +3 
1.. 3.. .4 . | ... +4 

new (1) = 2xold(2) + 1 
new (3) = -3xold(2) + 3 
0.. 0..-9 .. | ... -9 
0.. 1.. 1.. | ... +3 
1.. 0.. .1 . | ... -5 

new row(1) = old row 1 /-9 
0.. 0.. .1 .. | ... +1 
0.. 1.. 1.. | ... +3 
1.. 0.. .1 . | ... -5 

new (2) = old(2) - old(1) 
new (3) = old(3) - old(1) 
0.. 0.. .1 .. | ... +1 
0.. 1.. 0.. | ... +2 
1.. 0.. .0 . | ... -6 

so.. (x,y,z) = (-6, +2, +1)..
 
the last answer is correct 
Answer 2

Answer:

The solution is (–6, 2, 1). (Option A)

Step-by-step explanation:

Given three equations

2x + 4y - 3z = -7  →   (1)

3x + y + 4z = -12  →   (2)

x + 3y + 4z = 4    →   (3)

we have to find the solution of above equations.

By elimination method

Multiply equation (2) by 4 and then subtracting from (1), we get

(2x + 4y - 3z+7)-4(3x + y + 4z + 12)=0

  ⇒  -10x-19z=41 → (4)

Multiply equation (2) by 3 and then subtracting from (3), we get

(x + 3y + 4z - 4)-3(3x + y + 4z + 12)=0

  ⇒ -8x-8z=40 ⇒ x+z=-5 → (5)

Solving (4) and (5), we get

-10x-19z-41+10(x+z+5)=0

 ⇒ -9z=-9 ⇒ z=1

⇒ x+1=-5 ⇒ x=-6

and (3) implies -6 + 3y + 4 = 4 ⇒ y=2

Hence, the solution of above 3 equations will be (x,y,z)=(-6,2,1)

Hence, option (1) is correct.


Related Questions

Solve this problem
13=24+c

Answers

To solve this problem you need to use inverse operations, which is how to cancel out numbers.
13=24+c
-24
-11=c
Hope this helps!
13=24 +c
-24 -24
-11=c

Order the numbers from least to greatest.
0.21,1/5 , 0.18, 24%

Answers

1/5,0.18,0.21,24% 1/5 is .02 and 24% is 0.24

The arrangement from least to greatest is 0.18 < 0.20< 0.21< 0.24.

What is Ascending Order?

Numbers can be arranged in ascending order, from least value to highest value. The arrangement is left to right. Increasing order is another name for ascending order.

Given:

0.21,1/5 , 0.18, 24%

Now, writing each fraction in decimal form

1/5 = 0.2

24% = 24/100 = 0.24

So, we have the following numbers

0.21, 0.20, 0.18, 0.24

Hence, the arrangement from least to greatest is 0.18 < 0.20< 0.21< 0.24.

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what is the sum of the square roots of 16i?

Answers

Final answer:

The sum of the square roots of 16i is zero, as the positive and negative square roots cancel each other out when summed up.

Explanation:

The sum of the square roots of 16i is found by first determining the square roots of the given complex number. The complex number 16i can be expressed in terms of its polar form, which then allows us to apply De Moivre's Theorem in order to find the square roots.

First, 16i is purely imaginary, with a magnitude of 16 and an argument that is π/2 or -3π/2 radians. By taking the square root of its magnitude and halving the argument, we find the two square roots, which are in fact ±4√i. Therefore, if we consider both the positive and negative square roots, the sum of the square roots of 16i would be 4√i + (-4√i), which simplifies to 0.

Final answer:

The sum of the square roots of 16i is 4 + 4i * cos (π/8) + 4i * sin(π/8).

Explanation:

To find the sum of the square roots of 16i, we first need to find the square root of 16i. To do this, we can write 16i in polar form.

16i = 16(cos (π/2) + isin(π/2))

Then, we can find the square root of 16i by taking the square root of the magnitude and halving the argument.

√16i = √16(cos (π/4) + isin(π/4))

√16i = √16 * cos (π/8) + √16 * isin(π/8)

√16i = 4(cos (π/8) + isin(π/8))

Therefore, the sum of the square roots of 16i is 4 + 4i * cos (π/8) + 4i * sin(π/8).

A motorist traveled 311 miles on 12 gallons of gas. To the nearest tenth, how many miles can the motorist travel on one gallon of gas?
A) 0.03 miles
B) 23.8 miles
C) 24.6 miles
D) 25.9 miles

Answers

The answer is D 
311 / 12 = 25.9 


The answer is D) 25.9 miles, because you have to do 311 divided by 12 and you get 25.91 but you have to divide by the nearest tenth so your answer is D) 25.9 miles.

Line 1
x y
−1 1
0 3
Line 2
x y
1 5
3 3


(a) Write the equation for Line1 in slope-intercept form.
(b) Write the equation for Line 2 in slope-intercept form.

Answers

slope intercept is y=mx+b
m=slope
b=yint

find slope
the slope for 2 points (x1,y1) and (x2,y2) is
(y2-y1)/(x2-x1)


A.
(-1,1) and (0,3)
slope=(3-1)/(0-(-1))=2/1=2
y=2x+b
find b
(-1,1)
x=-1 an y=1
1=2(-1)+b
1=-2+b
add 2
3=b
y=-2x+3



B.

(1,5) and (3,3)
slope=(3-5)/(3-1)=-2/2=-1
y=-x+b
(3,3)
3=-3+b
add 3
6=b
y=-x+6






A. y=-2x+3
B. y=-1x+6

Answer:

im cool

Step-by-step explanation:

The product of (1/2 3/4i) and(1/2-3/4i) divided by (2-3i)

Answers

1/4-3/4
-----------
2-3i

-1/2
-------
2-3i


And that's simplified, assuming the blank was meant to be a +


The seventh term of the sequence -2, -6, -10, -14, ... is _____.

-26
-24
-22
-20
please help...

Answers

-26
the formula is -2-4(n-1)=2-4n
so the seventh term is 2-4*7=2-28=-26

Which answer describes the type of sequence?

200, 40, 8, 1.6, ...

geometric

neither arithmetic nor geometric

arithmetic

Answers

Answer:

it is geometric

Step-by-step explanation


We have been given with the series


200,40,8,1.6


Arithmetic sequence is the sequence in which difference between consecutive terms is same that is common difference d


d=a_2-a_1


d=40-200=-160   herea_2=40,a_1=200


d=8-40=-32          herea_2=8,a_1=40


We can see the difference is not same


Hence, the given sequence is not arithmetic sequence.


Geometric sequence is the sequence in which ratio of consecutive terms is same that is common ratio r


r=\frac{a_2}{a_1}


r=\frac{40}{200}=\frac{1}{5}   herea_2=40,a_1=200


r=\frac{8}{40}=\frac{1}{5}          herea_2=8,a_1=40


r=\frac{1.6}{8}=\frac{1}{5}             herea_2=1.6,a_1=8


We can see the ratio is  same.


Hence, given sequence is geometric


Therefore, Option 1 is correct given sequence is geometric.

Answer:

The correct answer is A. geometric

Step-by-step explanation:

5. If p || q, which pair of angles must be congruent?

1 and 8

2 and 5

4 and 6

7 and 8

Answers

Answer:

1 and 8.

Step-by-step explanation:

Two angles will be congruent if both measure the same. Then, as p is parallel to q we have that the alternate external angles (pair of angles out of the parallel lines, one on the right of the transversal line and the other on the left of the transversal line) has the same measure. In this case, 1 and 8 are alternate external angles.

Why isn't there work when carrying something horizontally at a constant speed?

Answers

Yes, your lifting force (counteracting g) is perpendicular, but isn't there also a horizontal ... So is pushing a an object at a constant velocity horizontally also 0 work? ... the sandbag is only vertical, but it doesn't move vertically so the work is 0.

how do you solve (x3 + 6x2 + 3x + 1 ) ÷ (x - 2)

Answers

We conduct long division, cancelling each term in x³ + 6x² + 3x + 1. As so:

x²(x -2) = x³ - 2x²
Subtracting from the original equation, we get:
8x² + 3x + 1

8x(x - 2) = 8x² - 16x
Subtracting from the new equation, we get:
21x + 1

21(x - 2) = 21x - 42
Subtracting from the new equation, we get:
43

The answer is x² + 8x + 21 with a remainder of 43.

Nathan cut 3 pieces of rope. Each was between 1.1 m and 1.2 m. Write down how long each piece might be.

Answers

the lowest amount would 3.3 meters long and the highest would be 3.6 meters long plz mark brainlest 


Find all solutions in the interval [0, 2π).
7 tan^3x - 21 tan x = 0

A) pi/3, 2pi/3, 4pi/3, 5pi/3
B) 0, pi/5, π, 6pi/5
C) 0, pi/3, 2pi/3, π, 4pi/3, 5pi/3
D) 0, pi/3, π, 4pi/3

Answers

Let tan x = a
7 tan^3 x - 21 tan x = 0 becomes
7a^3 - 21a = 0
7a(a^2 - 3) = 0
a = 0 or a^2 - 3 = 0
a = 0 or a^2 = 3
a = 0 or a = + or - √3

tan x = 0, tan x = √3, tan x = -√3
x = 0, pi, pi/3, 4pi/3, 2pi/3, 5pi/3

Holly made fruit punch for an office party a few months ago; she used 1 gallon of strawberry juice and 3 gallons of watermelon juice, which cost her a total of $8. For today’s party, she used 3 gallons of strawberry juice and 2 gallons of watermelon juice, spending a total of $10. How much does a gallon of each type of juice cost?

Write a system of equations to describe the situation and solve using elimination. (use x for strawberry juice and y for watermelon juice)

Answers

I know the equation, but not the answer sorry,

x+3y=8
3x+2y=10

then you would subtract 3y from that side so you now have

x=-3y+8

then you would place that into the equation ender it so
3(-3y+8)+2y=10
distribute
-9y+24+2y=10
add like terms
-7y+24=10
subtract 24 from both sides
-7y=-14
divide by 7 on both sides
y=2
and since a negative divided by a negative is a positive the answer is positive 2
then plug it back in to find x
x + 6=8
subtract 6 from both sides
x=2
so there you have it
x=2
y=2

A^2 + 4^2 = 5^2

A = __

Answers

3 is the correct answer

A student faculty government committee of 4 people is to be formed from 20 student volunteers and 5 faculty volunteers. Find the probability that the committee will consist of the following, assuming the selection is made at random: a. two students and two faculty members and b. one faculty member and three students. ...?

Answers

Final answer:

To solve the question, calculate the total possible ways to form a committee and the ways for each specific case. The probability can be determined by dividing the specific event by the total outcomes. This involves the mathematical principles of combinatorics and probability.

Explanation:

The question is dealing with the concept of combinatorics and probability. In such cases, we look at the total possible outcomes and the outcomes of our specific event of interest.

For the first case, we need to select 2 students and 2 faculty members from respective pools of 20 and 5. The total ways to form a committee are combinations of 4 from 25 (20 students + 5 faculty). So, we have:

Total outcomes = C(25,4)

The event of interest (2 students and 2 faculty) can be calculated as the product of combinations of selecting 2 from each pool:

Specific event outcomes = C(20,2)*C(5,2)

To get the probability, we divide the outcomes of our event of interest by the total outcomes.

The second scenario works similarly. You want one faculty and three students:

Specific event outcomes = C(20,3)*C(5,1)

You'd again divide this result by the total possible outcomes (determined the same as the first scenario) to obtain the desired probability.

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Final answer:

The probability of forming a committee with two students and two faculty members is 15%, while the probability of forming a committee with one faculty member and three students is 45%.

Explanation:

a. Two students and two faculty members:

To find the probability of selecting two students and two faculty members, we need to calculate the number of ways this combination can occur and then divide it by the total number of possible combinations.

The number of ways to select two students from 20 is C(20, 2) = 190.

The number of ways to select two faculty members from 5 is C(5, 2) = 10.

The total number of ways to form a committee of 4 from 25 volunteers is C(25, 4) = 12,650.

So the probability is (190 * 10) / 12,650 = 1900 / 12,650 = 0.15, or 15%

b. One faculty member and three students:

Similarly, the number of ways to select one faculty member from 5 is C(5, 1) = 5, and the number of ways to select three students from 20 is C(20, 3) = 1,140.

The total number of ways to form a committee of 4 from 25 volunteers is still C(25, 4) = 12,650.

So the probability is (5 * 1,140) / 12,650 = 5,700 / 12,650 = 0.45, or 45%

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The maximum value of f(x) = 2x^3 - 18x^2 + 48x - 1 on the interval [0, 3] is (4 points)

-1
39
35
71

Answers

A function assigns the values. The maximum value of f(x) = 2x^3 - 18x^2 + 48x - 1 on the interval [0, 3] is 39. thus, the correct option is B.

What is a Function?

A function assigns the value of each element of one set to the other specific element of another set.

To find the point at which the function has the maximum value we need to differentiate the function. Therefore, the function can be written as,

[tex]f(x) = 2x^3 - 18x^2 + 48x - 1 \\\\\dfrac{d}{dx}f(x) = \dfrac{d}{dx}(2x^3 - 18x^2 + 48x - 1)\\\\f' = 6x^2-36x+48[/tex]

Equate the function with zero to know at what value of x the function returns a maximum value.

6x² - 36x + 48 = 0

x² - 6x + 8 = 0

x² -2x -4x +8 = 0

(x-2)(x-4)=0

Since we want to the value in the interval of 0 to 3, therefore, 2 is the value at which the function will have its maximum value.

f(2) = 2(2)³ - 18(2)² + 48(2) - 1

f(2) = 39

Hence, The maximum value of f(x) = 2x^3 - 18x^2 + 48x - 1 on the interval [0, 3] is 39. thus, the correct option is B.

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Final answer:

To find the maximum value of the function f(x) = 2x^3 - 18x^2 + 48x - 1 on the interval [0, 3], locate the critical points and evaluate the function at the critical points and endpoints. The maximum value is 71.

Explanation:

To find the maximum value of the function f(x) = 2x^3 - 18x^2 + 48x - 1 on the interval [0, 3], we need to locate the critical points and the endpoints of the interval. First, find the derivative of the function: f'(x) = 6x^2 - 36x + 48. Set the derivative equal to zero and solve for x to find the critical points. Then evaluate the function at the critical points and the endpoints to find the maximum value.

The critical points are x = 1 and x = 4. Evaluating the function at these points: f(1) = -7 and f(4) = 71. Evaluating the function at the endpoints of the interval: f(0) = -1 and f(3) = 35. The largest value is 71, so the maximum value of f(x) on the interval [0, 3] is 71.

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The polynomial 6x2 + 37x – 60 represents an integer. Which expressions represent integer factors of 6x2 + 37x – 60 for all values of x?

3x – 4 and 2x + 15
3x + 4 and 2x – 15
2(x – 2) and 3(x + 5)
2(x + 2) and 3(x – 5)

Answers

I hope this helps you

Answer:

[tex]\text{The integral factors are }(3x-4)(2x+15)[/tex]      

Step-by-step explanation:

Given the quadratic polynomial

[tex]6x^2+37x-60[/tex]

we have to find the integral factors of the above polynomial.

[tex]\text{The polynomial is }6x^2+37x-60[/tex]

By splitting middle-term, the polynomial can be written as

[tex]6x^2+37x-60[/tex]

[tex]6x^2-8x+45x-60[/tex]

Taking 2x common from first two terms and 15 from last two terms.

[tex]2x(3x-4)+15(3x-4)[/tex]

Taking (3x-4) common

[tex](3x-4)(2x+15)[/tex]

which are required factors of given polynomial.

Hence, option 1 is correct.

Mary baked 21 cookies on Saturday and twice that many on Sunday for a school fundraiser. 4 cookies fell on the ground and had to be thrown out. If she packaged 3 cookies to a bag, how many cookies were left over?
A) 0
B) 1
C) 2
D) 3

Answers

C)2 Because she will be able to use 12 bags of 3 cookies each so 36 cookies. She baked 21 (2) cookies - 4 cookies that fell = 42 - 4 = 38 cookies.

The minute hand of a clock is 9.5cm long. how far will the tip of the hand travel in one day

Answers

24 hours, so 24 rorations

find teh circumference
c=2pir
c=2pi9.5
c=19pi

24 hours
19pi times 24=456pi cm per day aprox
1432.565952cm

Solve this 7(3x-4)=56

Answers

you need to expand the brackets first
21x - 28 = 56
then rearrange it
21x = 56 + 28
21x =84
divide it by 21 to get just x
x =4

hope this helps you

use benchmarks to estimate 2.81+3.73

Answers

The benchmarks are:  0,  0.25,  0.50,  0.75  and 1.
   2. 81   →  2.75
+
   3.73    →  3.75
------------
2.75 + 3.75 =  6.50

I need to know 0.98 as a percent

Answers

Answer is 98%

To turn any decimal into a percent, just move the decimal two spaces to the right.
Examples:
.5= 50%
.125= 12.5%
.25= 25 %

Answer:

98% hope this helped

Step-by-step explanation:

A graph thAt has a finite or limited number of data points is

Answers

It seems that you have missed the necessary options for this question, but anyway here is the answer. A graph that  has a finite or limited number of data points is called a DISCRETE GRAPH. On the other hand, the opposite for this graph is called the continuous graph. Hope this answers your question. 

The correct answer is:


Discrete graph.


Explanation:


A discrete graph is a graph of disconnected points.


Since they are disconnected, this means the graph only has values at the points drawn, not between.


The opposite of a discrete graph is a continuous graph; it is a graph of connected points. Since the points are connected, the graph has values between all of the points. This is similar to what we learned in geometry about a line; a line has an infinite number of points. This is true of the connections between points in a continuous graph.


Since a discrete graph is the opposite of a continuous graph, this means it does not have an infinite number of points; a discrete graph has a finite number of points.

Your class is learning how to tie knots.each student needs a peace of rope thatis 3/8 yards. how much do we need for 16 stdents

Answers

3/8 multiplied by 16
the answer is 6 
about 6 yards because

3/8 = .375
.375 × 16 = 6 yards

Select one of the factors of x3y2 + 8xy2 - 5x2 - 40.
Can someone help me figure this out?

answer choices
(xy2 + 5)

(x2 + 4)

(xy2 - 5)

(x2 - 8)

Answers

x³ y² + 8 x y² - 5 x² - 40 = 
= x y² ( x² + 8 ) - 5 ( x² + 8 ) = 
= ( x² + 8 ) ( x y² - 5 )
Answer:
On of the factors is:
C )  ( x y² - 5 )

Answer:

[tex](xy^2-5)\text{ is one factor of above polynomial}[/tex]

Step-by-step explanation:

Given the polynomial

[tex]x^3y^2+8xy^2-5x^2-40[/tex]

we have to select the option which is one of the factor of above polynomial.

[tex]x^3y^2+8xy^2-5x^2-40[/tex]

[tex]xy^2(x^2+8)-5(x^2+8)[/tex]

[tex](xy^2-5)(x^2+8)[/tex]

[tex]\text{Hence, }(xy^2-5)\text{ is one factor of above polynomial}[/tex]

∴ Option 3 is correct

a 6 feet tall boy cast a shadow of 9 feet at the same time of the day if the shadow of a tree measures 21 feet what is the height of the tree

Answers

Ratio of object to it's shadow = 6/9 = 2/3

So, height of the tree would be: 21 * 2/3 = 14 feet

So, your final answer is 14 feet

Hope this helps!

use a finite sum to estimate the average value of f on the given interval by partitioning the interval into four subintervals of equal length and evaluating the f at the subinterval midpoints.

f(x)=x^4 on [0,2]

Answers

Four partitions = 0 - 0.5, 0.5 - 1, 1 - 1.5, 1.5 - 2
Midpoints = 0.25, 0.75, 1.25, 1.75
Required sum = 0.5(0.25^4 + 0.75^4 + 1.25^4 + 1.75^4)/(2 - 0) = 0.5(0.00390625 + 0.31640625 + 2.44140625 + 9.37890625)/2 = 0.25(12.140625) = 3.03515625

function is a relationship between inputs where each input is related to exactly one output.

The average value of the function f(x) on [0, 2] is 3.03515625.

What is a function?

function is a relationship between inputs where each input is related to exactly one output.

Example:

f(x) = 2x + 1

f(1) = 2 + 1 = 3

f(2) = 2 x 2 + 1 = 4 + 1 = 5

The outputs of the functions are 3 and 5

The inputs of the function are 1 and 2.

We have,

f(x) = [tex]x^{4}[/tex] on [0, 2]

Partitioning the interval into four subintervals of equal length.

= 2-0 / 4 = 2/4 = 1/2 = 0.5

This means the four subintervals are:

[0, 0.5], [0.5, 1], [1, 1.5], and [1.5, 2].

Midpoints of each partitioned interval.

[0, 0.5] = 0.25

[0.5, 1] = 0.75

[1, 1.5] = 1.25

[1.5, 2] = 1.75

Now,

f(0.25) = [tex]0.25^{4}[/tex]

f(0.75) = [tex]0.75^{4}[/tex]

f(1.25) = [tex]1.25^{4}[/tex]

f(1.75) = [tex]1.75^{4}[/tex]

Now,

The average value of f(x) = [tex]x^{4}[/tex] on [0, 2].

= 1/2 [ ([tex]0.25^{4}[/tex] + [tex]0.75^{4}[/tex] + [tex]1.25^{4}[/tex]  + [tex]1.75^{4}[/tex])/(2 - 0)]

= 0.5 [ ([tex]0.25^{4}[/tex] + [tex]0.75^{4}[/tex] + [tex]1.25^{4}[/tex]  + [tex]1.75^{4}[/tex])/2 ]

= 3.03515625

Thus,

The average value of the function f(x) on [0, 2] is 3.03515625.

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Given the conditional statement "If it is January, then it is winter in the United States," which is true?

A) The Converse Of The Conditional
B) The Inverse Of The Conditional
C)The Contropositive Of The Conditional
D) Not Here ...?

Answers

Final answer:

Given the conditional statement, 'If it is January, then it is winter in the United States.' The convese and inverse aren't always true, but the contrapositive is, therefore, the correct answer is C) The Contrapositive of the Conditional.

Explanation:

The given statement is 'If it is January, then it is winter in the United States.' In logic, this statement is termed as a conditional statement. Let's analyze the options provided:

The Converse of the Conditional: This would reverse the statement to 'If it is winter in the United States, then it is January.' This is not always true since winter lasts for three months: December, January, and February.The Inverse of the Conditional: This would negate both the original statement's hypothesis and conclusion, resulting in 'If it is not January, then it is not winter in the United States,' which is also not always true.The Contrapositive of the Conditional: This reverses and negates the statement, turning it into 'If it is not winter in the US, then it is not January.' This statement is true. If it's not winter (meaning it's spring, summer, or fall), it cannot be January.

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What form of a quadratic function would be graphed if the vertex at the same point as the y-intercept?

Answers

The best form to use is standard form, which is, y=ax^2+bx=+c.
Other Questions
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