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andreyandreev [35.5K]
2 years ago
9

The size of matrices a and b are given. Find the sizes of ab and ba whenever they are defined. (if an answer does not exist, ent

er dne.) a is of size 6 ✕ 7, and b is of size 7 ✕ 8.
Mathematics
1 answer:
Julli [10]2 years ago
7 0

We have been given two matrices a and b. A has 6 rows and 7 columns, while b has 7 rows and 8 columns.

Since we know that order matters in matrix multiplication. In order for matrix multiplication to be defined number of columns in the first matrix should be equal to the number of rows of in the second matrix.

We can see that number of columns in matrix a and number of rows in matrix b is 7.

Therefore, size of ab will be equal to number of rows of matrix a and number of columns of matrix b that is 6 by 8.

Now we will see whether ba is defined or not. We can see columns in matrix b are 8 and rows in matrix a are 6, which is not equal. So we can say that ba is not defined.

Therefore, size of ba is not defined (dne).


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Rafael counted a total of 40 white cars and yellow cars there were 9 times as many white cars as yellow how many white cars did
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Answer:

Uhhhh si he counted 40 cars so just do 40 times 9 which is 360

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3 years ago
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Vivi is a drummer for a band. She burns 756 calories while drumming for 3 hours. She burns the same
german

The question you asked uses the concept of division, something that a bit tricky at first but gets easier as you master it!

So first let’s write and equation for your problem:

Let x = the amount of calories she burns each hour.

So we already know that Vivi was drumming for 3 hours, that she burned 756 calories, and that she burned the same amount of calories each hour.

Since she burned 756 calories in total, we know that the equation will have to equal 756:

= 756

We also know that the answer will be 3(hours) times x(the amount of calories), so now we just plug it into the equation:

3x = 756

To find what ‘x’ equals we have to divide both side by 3:

3x/3 = 756/3

Now all we have to do is simplify and you have your answer!

x = 252

And there you have it, Vivi burned 25 calories per hour!

Hope this helps! :)

6 0
2 years ago
Please answer this math question for me
vampirchik [111]

Answer:

D=90° E=103° F=77°

Step-by-step explanation:

D+90°=180°

D=90°

F+103°=180°

F=77°

E + F=180°

E=103°

6 0
2 years ago
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F(x)=-(x+7)^2+4 which of the following
solmaris [256]

Answer:

(x+7)^2+4

Step-by-step explanation:

(x+7)^2 + 4

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3 0
2 years ago
Find the volume <br> 6ft<br> 4ft<br> 3ft<br> (i know it’s not 72)
vlada-n [284]

Answer:

\fbox{Volume \:  of \:  pyramid \:  = 24 ft³}

Step-by-step explanation:

Given:

shape of object = Pyramidal

length of base l= 4ft

width of base w = 3ft

height of pyramid h = 6 ft

To find:

volume of pyramid = ?

Solution:

Volume  \: of \:  pyramid=  \frac{l \times w \times h}{3} \\ Volume \:  of \:  pyramid=  \frac{6 \times 4 \times 3}{3}  \\ Volume \:  of \:  pyramid=  \frac{24 \times  \not3}{ \not3}  \\ Volume \:  of \:  pyramid= 24 \:  {ft}^{3}

\fbox{Volume \:  of \:  pyramid \:  = 24 ft³}

<h3><em><u>Thanks for joining brainly community!</u></em></h3>
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