Mathematics High School

Given matrix A below, calculate det[A] twice using minors and cofactors

[tex]A = \left[\begin{array}{ccc}1&2&3\\3&4&5\\6&7&8\end{array}\right][/tex]

Pivot on:
a) row 2, and also
b) column 3

Answers

Answer 1

Answer:

a. 3(16-21) - 4(8-18) +5(7-12) = -15 + 40 - 25 = 0

b. 3(21-24) - 5(7-12) + 8(4-6) = -9 + 25 - 16 = 0

Related Questions

help pls i will give BRIANLY
cat is to feline as____is to porcine ​

Answers

Answer:

pig Lol

Step-by-step explanation:

but seriously

The answer you are looking for is ‘pig’
Porcine means resembling/is a pig, therefore pig is the answer!

how do u write an expression for "twenty times a number less than two."

a.2 - 20y
b.20y-2
c.20 (y-2)

Answers

C , have a good rest of your day!

Answer:

20(y-2)

Step-by-step explanation:

-4x-3(-44-23)=13


please show the work, i’ll mark brainliest

Answers

Answer:

47

Step-by-step explanation:

Let's solve your equation step-by-step.

−4x−3(−44−23)=13

Step 1: Simplify both sides of the equation.

−4x+201=13

Step 2: Subtract 201 from both sides.

−4x+201−201=13−201

−4x=−188

Step 3: Divide both sides by -4.

−4x

−4

=

−188

−4

x=47

4
It takes Naomi 4 minutes to run 5 laps.
How many laps per minute is that?
Ebon

Answers

Answer:

1.25 per min

Step-by-step explanation:

divide 5÷4 and you get 1.25 per min

the root of equation 1/x-1 +1/x-2 = 1/x-3

Answers

Answer:

The roots of the quadratic equation  are  , .

Step-by-step explanation:

The roots of the quadratic equation  are  , .

Step-by-step explanation:

As given the equation in the form

Simplify the above equation

(x-2)-x = 3x × (x-2)

x-2 - x = 3x² - 6x

3x² - 6x + 2 = 0          

As the equation is written in the form ax² + bx + c = 0

a = 3 , b = -6 , c = 2

Put all the values in the above equation

Thus

Therefore the roots of the quadratic equation  are  , .

Could someone help I’m so confused

Answers

Answer:

6/4

Step-by-step explanation:

ratio of x to y is the slope so

you can use butterfly method/cross multiply (multiply numerator on one side to the denominator on the other to bring all the terms up and then solve for y)

4(y+3)=6(x+2)

4y+12=6x+12

y=6/4x

so it would be 6/4

i am bad with money problems help meh please ;-;

Answers

Answer:

b

Step-by-step explanation:

Answer:

4.96*6.57*8.02*2.31=603.716984464

3 A Gas station A charges $3.50 per gallon of gas plus 58 for a car wash. Gas station B charges $3.25 per gallon of gas plus S10 for a car wash. How many gallons of gas must a customer purchase for the total cost to be the same at both gas stations? ​

Answers

9514 1404 393

Answer:

  8 gallons

Step-by-step explanation:

The $2 difference in the price of a car wash is made up by the gas purchase at the rate of $0.25 per gallon. So, it takes ...

  $2/($0.25/gal) = 8 gal

to make the costs the same.

The customer must purchase 8 gallons for the total cost to be the same at both gas stations.

___

  3.50g +8 = 3.25g +10 . . . . costs at each station for g gallons of gas + wash

  0.25g = 2 . . . . . . . . . subtract 3.25g+8 from both sides

  g = 2/.25 = 8 . . . . . . the way we did it above

6th grade math help me pleaseeee

Answers

Answer:

Top left

Step-by-step explanation:

Look at the numbers it's going through. The x axis is the one going side to side, y is up and down

Expression 3x²+4x-5
x=0​

Answers

Answer:

x = {1/3, 0}

Step-by-step explanation:

What would Hope be attempting to find if she writes d(4) = 78(4)?

Answers

Answer:

d=78

Step-by-step explanation:

so you would divide both sides of the equation by 2×2

d×4÷(2×2)=78×4÷(2×2) <- you would do this to get rid of 4 so you cna get the d alone

d=78×4÷(2×2) <- thats the other side of the equation btw

then it would be:

d=39×2

d=78

HEY CAN ANYONE PLS ANSWER DIS MATH PROBLEM!!!
PLS I RLY NEED IT RN!!!

Answers

Answer:

Step-by-step explanation:

one point is (-2,5)

5y-25=-11x-22

11x+5y=25-22

11x+5y=3

5y=3-11x

[tex]y=\frac{3-11x}{5} \\x=-2,y=5\\x=3,y=-6\\[/tex]

so points are (-2,5) and (3,-6)

draw a line through these points.

A pound of blueberries cost $3.98 and a pound of clementines cars $2.49 what is the combined cost of 0.6 pound of blueberries and 1.8 pounds of clementines

Answers

The answer is $3.87 explaining is

What is AC for brainliest

Answers

Answer : 6.4

Way to do

•Triangle 1

#Find CD first use tan formula

tan(∅) = opposite / adjuscent

tan(45) = CD / 5

CD = 5 × tan(45)

CD = 5

•Triangle 2

#Now you can find AC use Pythagoras theorem (c = AC)

a² + b² = c²

4² + 5² = c²

16 + 25 = c²

41 = c²

c = √41

c = 6.4

so, AC is 6.4

#Give me brainliest ok? im tired writing all of this

cuántas aristas tiene un cilindro​

Answers

un cilindro tiene dos bordes

Can you Help me please lol

Answers

Answer:

Slope is 4/5

Step-by-step explanation:

The two points are (3,3) and (-2,-1)

The slope formula is Y2-y1 / x2-x1

So substituting in

-1-3/ -2 -3

-4/-5 = 4/5

You can check it by "walking" up 5 and over to the right 4 on the graph and see that it works.

their is no point for brainly if you need to sign in I don't wanna be mean tho

Answers

but it helps with homework and learning how to do stuff you dont know how to do

Please help me. Thank you so much

Answers

Answer:

x = 10

Step-by-step explanation:

Kelly was building a bed for her dollhouse. She used her bed, which is 4 feet × 6 feet, as a guide. She scaled down the dimensions of her bed by a factor 1 over 5. What are the dimensions of the model bed she built?

0.8 foot × 1.2 feet
0.4 foot × 0.6 foot
0.08 foot × 0.12 foot
0.04 foot × 0.06 foot

Answers

Answer:

A  

0.8 foot × 1.2 feet

Step-by-step explanation:

What is the equation that best represents the relationship between x and y in the graph?

Answers

Answer:

y= -3/4x-3

Step-by-step explanation:

m= -3/4

y-int.= -3

i need to make equations with the models

Answers

Answer:

I dont know ask someone else I just here for the points

Write down the next two terms in this number pattern
19, 14, 9, 4,​

Answers

the sequence is -5 everytime, it would be 19,14,9,4, -1, -6 because you are subtracting 5 everytime. i hope this helps

Answer:

points. points.

Step-by-step explanation:

pointssss

also, -1, -6

what is the answer 1/2(4t + 6) = 25

Answers

Answer:

( 11 2 + y ) ( 11 2 + y ) = 8

Step-by-step explanation:

Answer:

t=11

Step-by-step explanation:

Step 1: Simplify both sides of the equation

1/2(4t+6)=25

(1/2)(4t)+(1/2)(6)=25

2t+3=25

Step 2: Subtract 3 from both sides

2t+3−3=25−3

2t=22

Step 3: Divide both sides by 2

2t/2 = 22/2

 

22 divided by 2 is 11

2(x + 4) − 1 = 2x + 7

Answers

Answer:

All real numbers are solutions to this problem.

Step-by-step explanation:

I) Simplify:

2(x + 4) - 1 = 2x + 7

x + 4 - 0.5 = x + 3.5 (Divide by 2)

x + 3.5 = x + 3.5 (Simplify x + 4 - 0.5)

x = x

II) Conclusion:

Any real number will work as a solution.

True for all x


2x+7=2x+7
-7 -7
2x = 2x
-2x -2x
0=0

maybe that seems right

How long is the missing side length?
1 point
12.2
4.6
7.6
11.3
ОО
ОО
127.7
196

Answers

Answer:

Figure it out

Step-by-step explanation:

A machine produces 80 boxes per
minute. How many boxes does the
machine produce 2 hours?
A. 220
B. 13,200
C. 29,100
D. 6,600

Answers

Answer:9,600 boxes

Step-by-step explanation:

60 mins in 1 hr = so 120 minutes in 2 hrs

80 boxes/ per minute

so 80 x 120 minutes = 9,600 boxes

What is the value of x?

Enter your answer, as a decimal, in the box.

Answers

Answer:

Step-by-step explanation:

The following ratio solves the problem

AM/MN = x / MP

(67.2 - 32) /67.2 = x / 81.9

35.2 / 67.2 = x / 81.9

Cross Multiply

67.2 * x = 81.9 * 35.2

67.2 x = 2882.88

Divide by 67.2

x = 2882.88 / 67.2

x = 42.9

Mr Todd buys 7 drinks at 48p each and 8 drinks at 52p each. What is the total cost of the 15 drinks?

Answers

Answer:

80p

if you are adding 4p every time you add a drink you will be adding 7  drinks therefore you have to do (7x4p) this will equal 28p then you have to add 28p to 52p

Hope this helps

Find the slope and the y-intercept of the graph of the linear equation. y=3−12x

Answers

Slope is -12 and y-intercept is 3

F(3)=?

f(x)=2x^2+x+7

Answers

The answer would be 28
F(3)=?

f(x)=2x^2+x+7

This simply means where you see x substitute it for 3

F(3) = 2(3^2) + 3 + 7
= 2(9) + 3 + 7
= 18 + 3 + 7
= 28

Therefore F(3) = 28
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