1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Darina [25.2K]
3 years ago
10

By using determinant method solve following questions 3x+4y+5z=18. 2x-y-8z=13. 5x-2y+7z=20​

Mathematics
2 answers:
Sauron [17]3 years ago
8 0

Answer:

Copied text is stored in the clipboard for 1 hour.

Pavel [41]3 years ago
5 0
3x+4y+5z=18,2x−y+8z=13,5x−2y+7z=20 D= ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ 3 2 5 4 −1 −2 5 8 7 ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ =3(−7+16)−4(14−40)+5(−4+5) =3(9)−4(−26)+5(1)=27+104+5=136 D 1 = ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ 18 13 20 4 −1 −2 5 8 7 ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ =18(−7+16)−4(91−160)+5(−26+20) =18(9)−4(−69)+5(−6)=162+276−30=408 D 2 = ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ 3 2 5 18 13 20 5 8 7 ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ =3(91−160)−18(14−40)+5(40−65) =3(−69)−18(−26)+5(−25)=−207+468−125=136 D 3 = ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ 3 2 5 4 −1 −2 18 13 20 ∣ ∣ ∣ ∣ ∣ ∣ ∣ ∣ =3(−20+26)−4(40−65)+18(−4+5) =3(6)−4(−25)+18(1)=18+100+18=136 Now, x= D D 1 = 136 408 =3 y= D D 2 = 136 136 =1 z= D D 3 = 136 136 =1 Hence, the solution for the system is (3,1,1).
You might be interested in
Solve for x cos90=4/x
n200080 [17]

Answer:

<h2>no solution</h2>

Step-by-step explanation:

\text{We know:}\ \cos90^o=0.\\\\\text{Therefore}\\\\\cos90^o=\dfrac{4}{x}\to\dfrac{4}{x}=0\qquad\bold{FALSE}

7 0
3 years ago
Please help! Is it 0.0364?
NNADVOKAT [17]

Answer:

0.0636

Step-by-step explanation:

The probability the first die has twelve sides is 4/11.

The probability the second die has twelve sides is 3/10.

The probability the third die does not have twelve sides is 7/9.

The probability the fourth die does not have twelve sides is 6/8.

The probability of all four events is:

4/11 × 3/10 × 7/9 × 6/8 = 0.0636

7 0
4 years ago
The tires on your bicycle have a diameter of 20 inches. How many rotations does each tire make when you travel 500 feet?
Marizza181 [45]

Answer:

Rotations of tire to travel 500 feet: 95.54

Step-by-step explanation:

Circumference = 20 x 3.14 = 62.8 in

500 feet = 500 x 12 inches = 6,000 in

Rotations = 6000 / 62.8 = 95.54 rotations of tire

6 0
3 years ago
In a regional high school swim meet, women’s times (in seconds) in the 200-yard freestyle ranged from 108.5 to 140.6. Estimate t
avanturin [10]

Answer: Estimated the standard deviation α  = 5.35

Step-by-step explanation:

According to Empirical rule, the largest value is approximately:

ц + 3α

And the smallest value is approximately:

ц + 3α

Based on the given figures in the question, we can say

ц + 3α = 140.6

ц - 3α = 108.5

Now subtracting these two; we have

ц + 3α - ( ц - 3α  ) = 140.6 - 108.5

ц + 3α - ц + 3α = 32.1

6α = 32.1

α = 32.1 / 6

α = 5.35

Estimated the standard deviation α  = 5.35

6 0
4 years ago
Please write me an essay about the trade market.
Kazeer [188]

Answer: Trade marketing is a discipline of marketing that relates to increasing the demand at wholesaler, retailer, or distributor level rather than at the consumer level. However, there is a need to continue with Brand Management strategies to sustain the need at the consumer end. A shopper, who may be the consumer him/herself, is the one who identifies and purchases a product from a retailer.

Step-by-step explanation:

3 0
3 years ago
Other questions:
  • A milk truck carries milk with density 64.6 lb/ft3 in a horizontal cylindrical tank with diameter 12 ft.
    6·1 answer
  • Two hundred people were surveyed about their favorite outdoor leisure activity. The results of the survey are displayed in the c
    9·1 answer
  • Find the y-intercept of the line: 5x + 7y +1 = 0
    12·1 answer
  • Simplify the expression (x - 2y) + (3x + 4y)
    13·1 answer
  • What is the value of x in the equation 2(x - 4) - 4(2x + 1)?
    8·1 answer
  • Pleaseeee helpppp answer correctly !!!!!!!!!!!!!! Will Mark Brianliest !!!!!!!!!!!!!!
    5·1 answer
  • 22+b-c= <br><br> Can anyone help me pleaseeeee
    15·2 answers
  • Convert 555 into base five numeral system .( no link pls)............​
    14·1 answer
  • Francis bought 2 video games for $29.95 each and 1 DVD for $9.95. If the sales tax is 8%, what is the total cost of Francis's pu
    15·1 answer
  • I don't understand this and serval people have got it wrong.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!