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3 years ago

Thank u for all the amazing answers everyone :)

Mathematics

2 answers:

Mariana [72]3 years ago

7 0

You're welcome great job

Dennis_Churaev [7]3 years ago

5 0

I'm sorry if I wasn't there to help but thank the others, and thank you :)

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Given the matrices: 1 2 A= 1 -1 2 1 1 B= 3 4 Calculate AB: C11 C12 [2.1] х 1 2 3 4 C21 C22 C11 = C12 = -2 C22 - C215 DONE

eduard

Answer:

$\:c_{11}=-2,\:\:\:c_{12}=-2$

$\:c_{21}=5,\:\:\:c_{22}=8$

Step-by-step explanation:

Given the matrices

$A=\begin{pmatrix}1&-1\\ 2&1\end{pmatrix}$

$B=\begin{pmatrix}1&2\\ \:3&4\end{pmatrix}$

Calculating AB:

$\begin{pmatrix}1&-1\\ \:\:2&1\end{pmatrix}\times \:\begin{pmatrix}1&2\\ \:\:3&4\end{pmatrix}=\begin{pmatrix}c_{11}&c_{12}\\ \:\:\:c_{21}&c_{22}\end{pmatrix}$

Multiply the rows of the first matrix by the columns of the second matrix

$=\begin{pmatrix}1\cdot \:1+\left(-1\right)\cdot \:3&1\cdot \:2+\left(-1\right)\cdot \:4\\ 2\cdot \:1+1\cdot \:3&2\cdot \:2+1\cdot \:4\end{pmatrix}$

$=\begin{pmatrix}-2&-2\\ 5&8\end{pmatrix}$

Hence,

$\begin{pmatrix}c_{11}&c_{12}\\ \:\:\:c_{21}&c_{22}\end{pmatrix}=\begin{pmatrix}-2&-2\\ \:5&8\end{pmatrix}$

Therefore,

$\:c_{11}=-2,\:\:\:c_{12}=-2$

$\:c_{21}=5,\:\:\:c_{22}=8$

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Answer: The shape of the cross section will be triangular.

Step-by-step explanation:

The cross section is the shape the shows when you cut a straight line. no matter where you cut it, you will still get a triangle.

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6 can only go into 6 once

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X - 11 / 3 = - 4 / 5 x + 5 / 6

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Answer:

SOLVE FOR X

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Consider a parallelogram in which one side is 3 inches long, another side measures 4 inches, and the measurement of one angle is

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Only one parallelogram can be drawn based on the given conditions.

Step-by-step explanation: just believe me

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