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svetlana [45]
3 years ago
12

If Matrix A has dimensions 1x4 and Matrix B has dimensions 3x4, can these be multiplied?

Mathematics
2 answers:
Inga [223]3 years ago
6 0
\bf A=
\begin{bmatrix}
\square &\square &\square &\square 
\end{bmatrix}\qquad \qquad 
B=
\begin{bmatrix}
\square &\square &\square &\square \\
\square &\square &\square &\square \\
\square &\square &\square &\square \\
\end{bmatrix}

notice above, the matrix A has 1 row 4 columns, a 1x4,
and the B matrix has 3 rows and 4 columns, 3x4.

since B has only 3 rows, not 4, no dice.
Kipish [7]3 years ago
3 0
Answer: No. You cannot multiply the matrices in any order. A*B is not defined. Also, B*A is not defined.

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

Explanation: 

Matrix A has 1 row, and 4 columns. 
Matrix B has 3 rows, and 4 columns

In order for A*B to be possible, A has to have the same number as columns as B has rows. In other words, the inner dimensions have to match up. The '4' in '1x4' needs to match up with the '3' in the '3x4'. This match doesn't happen. 

The same story happens with B*A, just things have been flipped. 

B has 3 rows, 4 columns
A has 1 row, 4 columns

The "4 columns" of B does not match with "1 row" of A. 
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43.
aleksklad [387]

Answer:

4.12 kg

Step-by-step explanation:

Regular cakes:

1 dozen normal sponge cakes: 264 g plain flour

Vegetarian cakes:

1 dozen cakes: 264 g plain flour

4 eggs are replaced by 4 * 30 g of flour = 120 g flour

total flour for 1 dozen vegetarian cakes = 264 g + 120 g = 384 g

Proportion for regular cakes:

12 cakes to 264 g flour = 100 cakes to x grams flour

12/264 = 100/x

12x = 26400

x = 2200

2200 g flour for 100 regular cakes

Proportion for vegetarian cakes:

12 cakes to 384 g flour = 60 cakes to y grams flour

12/384 = 60/y

12y = 384 * 60

12y = 23040

y = 1920

1920 g flour for 60 vegetarian cakes

Total flour needed:

2200 g + 1920 g = 4120 g

4120 g * 1 kg/(1000 g) = 4.12 kg

Answer: 4.12 kg

4 0
3 years ago
3. (03.01)<br> Which expression is equivalent to 3(5 + 6)?<br> 8+9<br> 8 + 6<br> 15 + 18<br> 15 + 6
Afina-wow [57]

Answer:tytgh

Step-by-step explanation:

8 0
2 years ago
Find the rate of change
Fantom [35]

Answer:

b

Step-by-step explanation:

$25 per day

it's "b" because as days increase the cost of dollars gets added by $25 per day.

Hope this helped!

6 0
3 years ago
Mike and his friends bought cheese wafers for $2 per packet and chocolate wafers for $1 per packet at a carnival. They spent a t
trapecia [35]
A. 2x+y=25; x+y=20
x represents cheese wafers and y represents chocolate wafers.

B. I will choose elimination since there is y and y. I can multiply one equation by -1 to get y and -y, which cancels out.
2x+y=25
-x-y=-20

Add equations
x=5

Plug x in
5+y=20
y=15

Final answer: 5 cheese wafers, 15 chocolate wafers
4 0
3 years ago
12 is 30% of what number?
Sladkaya [172]

Answer is provided in the image attached.

4 0
3 years ago
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