Suppose matrix D is the inverse of matrix C. Which of the following is equal to D?
O CDD
O CCD
O DDD
O CCC

Answers

Answer 1
Answer is First answer choice: CDD

==========================================

Explanation:

C and D are inverses of each other. When they multiply together, they will produce the identity matrix I

C*D = I

D*C = I

note: this is the uppercase letter 'i' and not the number one. The 'i' stands for 'identity'. Another thing to note is that matrix multiplication is not normally commutative, but it works for matrix inverses.

--------------------

So this means C*D*D = (C*D)*D = (I)*D = I*D = D because multiplying the identity matrix with some matrix X leads to the same matrix X.

This is why the first choice is the answer.

The second choice doesn't work because C*C*D = C*(C*D) = C*(I) = C*I = C

The third choice doesn't work because we don't have any C's here. All we can say is that D*D*D = D^3

Similarly choice 4 doesn't work as all we can say is C*C*C = C^3.


Related Questions

Solve for x: 3x − 2 > 5x + 10.

Answers

Answer: hopefully this is what you need

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

Inequality form:

X < -6

Interval Notation:

(-♾, -6)

May someone please help with this graph and equation please?​

Answers

Answer:

y=-2x+8

Step-by-step explanation:

Which best describes the y coordinate of a point

Answers

Answer:

The vertical value in a pair of coordinates. How far up or down the point is. The Y Coordinate is always written second in an ordered pair of coordinates (x,y) such as (12,5). In this example, the value "5" is the Y Coordinate. Also called "Ordinate"

Step-by-step explanation:


Use the formula to help you answer the question below. Do not include units
in your answer.
Rate . Time = Distance
How many hours will it take to complete a 45-km bike ride if you go 12 km per
hour the whole time?

Answers

It will take about 3.75 hours to complete.

Stephanie and alejandro
were planning thier wedding.
Stephine saved up four times.
more money than alejandro
because he lost his job at walmart. Together $15,600 How much did each one save ?
steps ?

Answers

Answer:

Stephanie saved

Step-by-step explanation:

x+4x=15600

5x=15600

divide by 5 on both sides

you get 3120

since stephanie got 4 times more, you multiply 3120*4 and get 12480

therefore, Alejandro saved 3120

: )

1. A space figure with two parallel and congruent bases can be any of these except a
A cone
B prism
c cylinder
Dcube

Answers

Answer:

C. cylinder

Step-by-step explanation:

i hope this help

A spec figure with two parallel and congruent bases can be c

Which of the following inequalities is correct?

Answers

Answer:

a < b < c

Step-by-step explanation:

a is -4, which is less than b, at 1, and c at 7.

If this answer is correct, please make me Brainliest!

Answer:

the answer is a it cant not be b,c

Please help it’s timed

Answers

Answer:

y=45

x=90

Step-by-step explanation:

x is a right angle, y is vertical from 45 degrees making it congruent to it.

Answer:

C: x=90 y=45

Step-by-step explanation:

The place where x is is obviously a right angle therefore, it is 90. Then here is a diagonal line cutting through the 90 degrees in half. 90/2=45.

Simplify -5 to the 2nd power, + 8 |-1| + (-3).

Answers

Answer:

-19

Step-by-step explanation:

Answer:

− 10 n d  +  5

Step-by-step explanation:

of the following numbers, which has the most factors of 3?
a) 81
b) 270
c) 999
d) 3333

Answers

Answer:

81 has the most factors of 3

Step-by-step explanation:

To conclude which of the following options has the most factors of 3, take each of the number's prime factorization, which will help us solve the problem.

( 1 ) 81 is a composite number and is 9 squared. Knowing that 3 squared = 9, we can say that the prime factorization of 81 = 3 [tex]*[/tex] 3 [tex]*[/tex] 3 [tex]*[/tex] 3, which can also be denoted as 3⁴.

( 2 ) 270 is a composite number. The exponents in the prime factorization are 1, 3, and 1, and therefore it's prime factorization is - 3 [tex]*[/tex] 5 [tex]*[/tex] 3 [tex]*[/tex] 2 [tex]*[/tex] 3, composed of 3 3s.

( 3 ) If we put all of it together we have the factors 3 x 3 x 3 x 37 = 999. It can also be written in exponential form, with 3 to the power of 3 - hence having 3 factors of 3.

And finally the value 3333 has the prime factorization of 3 [tex]*[/tex] 11 [tex]*[/tex] 101, and as you can see it has 1 factor of 3. 81, having 4 factors of 3, is present with the most factors, and therefore is our solution.

Number 81 has the most number of factor 3. Option A is correct.

A number from the options to be determined that has the most number of factor 3.

What are the factors?

factors can be defined by splitting the value into multipliable values.

Here,
Factors of 81 = 3,3,3,3            Number of factor 3 = 4
Factors of 270 =2,3,3,3,5       Number of factor 3 = 3  
Factors of 999 =3,3,11             Number of factor 3 = 2
Factors of 3333 = 3,11             Number of factor 3 = 1
As per the above comparison, 81 has the most number of factor 3.

Thus, Number 81 has the most number of factors 3.

Learn more about Factors here:
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Solve the following system of equations using any method you want.
y + 2x = 2
2x - 5y = 14 please help

Answers

2x+y=2
2x-5y=14
Subtract the two equation
6y= -12
Y= - 2
Put y= -2 in any equation
2x-2=2
2x=4
X=2

Answer:

y = - 2, x = 2

Step-by-step explanation:

Remove x and solve for y

2x - 2x - 5y - y = 12

-6y = 12

y = - 2

Substitute y back into the equation

-2 + 2x = 2

2x = 4

x = 2

Write a linear equation from a slope and a point

Answers

Slope=4/2 point=(1,2)
2=4/2(1)+b
b=0
y=2x

How do you know when expression are equivalent

Answers

Answer:

If two things are equivalent, they are the same. Equivalent expressions are expressions that are the same, even though they may look a little different. If you plug in the same variable value into equivalent expressions, they will each give you the same value when you simplify.

Step-by-step explanation:

Answer: Two expressions are said to be equivalent if they have the same value irrespective of the value of the variable(

Step-by-step explanation:

What are the square roots of 64144?

−412 and 412

−3272 and 3272

−812 and 812

−49 and 49

Answers

Answer:

-812 and 812

Step-by-step explanation:

Please please please please please please please pppppppllllllllllleeeeeeeaaaaasssseeehelp

Answers

Answer:

70

Step-by-step explanation:

its in the tens value

Answer:

70

Step-by-step explanation:

The number is in the tenths place.

In Triangle PQR, the measure of R=90°, RP=57 feet, and QR = 93 feet. Find the measure of P to the nearest tenth of a degree.

Answers

Answer:

58.5

Step-by-step explanation:

Answer:

58.5

Step-by-step explanation:

The diagram below shows ΔPQT; its altitude, which is segment PR ; and some of its measurements.

(a) What is mTPR? Show or explain how you got your answer.


For Parts (b), (c), and (d), write the exact answer in simplified radical form.


(b) What is the length, in inches, of segment PR? Explain your answer.


(c) What is the length, in inches, of segment TR? Explain your answer.


(d) What is the length, in inches, of segment PQ? Explain your answer.

Answers

Answer:

i need some poitns plssss

A circle has a radius of 5/3 units and is centered at (9.2 -7.4)

Write the equation of the Circle.

Answers

Answer:

(x - 9.2)^2 + (y + 7.4)^2 = (5/3)^2

Step-by-step explanation:

We start with (x - h)^2 + (y - k)^2 = r^2.  The center is (h, k) and the radius is r.

Then we have:

(x - 9.2)^2 + (y + 7.4)^2 = (5/3)^2

Kathy found the volume of the figure using the expression (4 * 3 * 8) + (10 * 3 * 4). Sandy found the volume of the figure using the expression (3 * 10 x 4) + (4 * 3 * 4). Use the drop-down menus to explain who is correct. 10 cm Click the arrows to choose an answer from each menu, The expression for the volume of the figure was correctly determined by Choose... because the figure was divided into two rectangular → prisms that Choose...

Answers

Answer:

The correct options are;

1) Sandy is correct

2) The figure was divided into two rectangular prisms that are calculated separately

Step-by-step explanation:

Here we have to divide the figure into two rectangular prisms so as not to calculate for a dimension twice

Therefore, the figure can be split into a horizontal prism at the top with dimensions and volume = 10 × 4 × 3 and the vertical prism below will now have a dimension and hence, volume of 4 × 4 × 3

Therefore the volume of the figure is the sum of the volumes of the two prisms found as follows;

Volume of the figure =  10 × 4 × 3 + 4 × 4 × 3  = 168

We can try the othe way to confirm as follows

Volume of the prism below = 4 × 3 × 8 = 96

Volume of the horizontal prism above is now = 4 × 3 × 6 = 72

Volumre of the figure = 96 + 72 = 168

Therefore, since the volume = (10 × 4 × 3) + (4 × 4 × 3), Sandy is correct

Because the figure was divided into two rectangular prisms that are calculated separately.

Answer:

1(sandy is correct)

2(do not overlap

Step-by-step explanation:

BC =
Round your answer to the nearest hundredth.

Answers

Answer:

Since its a right triangle you automatically know the C is 90 degrees. And since all triangle have to add up to 180 degrees, you know B has to equal 40 degrees.

A= 50

B= 40

C= 90

B + C

40 + 90

BC = 130 degrees

Answer:

2.3

Step-by-step explanation:

Khan

Which has a value closest to 9?
✓99
V83
VIO
V63

Answers

Answer:

[tex]\sqrt{83\\}[/tex] has the closet value to 9 bc its 9.11

V83 because it makes the most sense

Ken baked a pan of brownies for a potluck. The number of squares he cuts the brownies into will depend on the number of people attending the potluck. s = the number of squares Ken cuts the brownies into. p = the number of people attending the potluck. Which of the variables is independent and which is dependent?

Answers

Answer:

P is the independent variable while S is the dependent variable

Hope this Helps :)

George still has 40 percent of his book to read. If George has read 180 pages, how many pages does he still have to read? How do you know?

Answers

Answer:  72

Step-by-step explanation:    so you do a line = line method the lines should look like they are fractions.  

you do it for the both numbers the percent is always out of 100.

it should look like this

40%            ?

--------- = -----------    

100%       180

then you cross multiply 40 and 180 and than divide it by 100.   your answer should be 72.    you later replace the ? with 72

you know this because It is smaller than 180 and its bigger than the number 40.

The number pages left to read is 12 pages.

Given that, George still has 40 percent of his book to read.

What is percentage?

Percentage is defined as a given part or amount in every hundred. It is a fraction with 100 as the denominator and is represented by the symbol "%".

Let the total number of pages be x.

Now, x-40% of x=180

⇒ x-0.4x=180

⇒ 0.6x=180

⇒ x=180/0.6

⇒ x=300

So, remaining pages = 300-180=120

Therefore, the number pages left to read is 12 pages.

To learn more about the percentage visit:

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Please Help Now Running out of time! In Sal’s sock drawer, there are 2 red, 2 blue, 2 yellow, 2 black, and 2 green socks. If he randomly picks one sock from the drawer, and then another, which fractions should Sal multiply to find the probability of choosing a pair of green socks?

Answers

Answer:

Step-by-step explanation:

C

Answer:

C

Step-by-step explanation:

2/10 1/9

Starting the first week of January, Mari puts $1.50 in her coin bank every week. How much money will she have at the end of the year?
A.
$18.00
B.
$63.00
C.
$78.00
D.
$72.00


BRAINLIEST ANYTHING!!

Answers

Answer:

C

Step-by-step explanation:

52 weeks of the year * 1.5

Answer:

The answer is C $78.00 because 52 times 1.50 equals 78 so if you couldn't the amount of weeks from january to december 31 it equals 52.

Step-by-step explanation:52 times 1.50 =78

(x + m)(x + n) if m= 5 and n = -7

Answers

Answer:

[tex]x^2-2x-35[/tex]

Step-by-step explanation:

[tex](x+5)(x-7)=[/tex]

[tex]x^2+5x-7x-35=[/tex]

[tex]x^2-2x-35[/tex]

Hope this helps!

Answer:

X^2-2x-35

Step-by-step explanation:

(X)(x)+(x)(-7)+(5)(x)+(5)(-7)

X^2-7x+5x-35

X^2-2x-35

Hope that was the answer you were looking for

The value of x 3y, for x = -2 and y = 3, is -24. True False

Answers

Answer:

true

Step-by-step explanation:

x^3 y when x = -2 and y = 3

(-2)^3  * 3

-8 *3

-24

This is true

Someone please help me. I’m not good at mah but I would be thankful for ur help.

Answers

the perimeter is 44 inches!!

Answer:

1. 44 inches

hope this helps :)

!!!!!!NEED HELP !!!!!! y=-50x + 750 which of the following does NOT match the equation shown.

Answers

Answer:

I think its B

Hope it helps :/

Answer:

y=10x-50

Step-by-step explanation:

5
Amelia and Roger both
found the volume of the sphere
below. Determine which
student correctly determined
the volume of the sphere.
3 cm
AMELIA
113.10 cm
ROGER
14.14 cm

Answers

Answer: the last one

Step-by-step explanation:

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