3 years ago

PLEASEE HELP!!! find the area (look at the picture)

Mathematics

1 answer:

Lyrx [107]3 years ago

6 0

Answer: Area= 60The Area is 60

Step-by-step explanation: Multiply 5 and 12 and you get 60!! I hope it helped!

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Given the following matrices, what 3 elements make up the first column of the product matrix DA?

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We have to figure out what the product of DA is,

$\begin{bmatrix}-1&2&3\\8&-4&0\\6&7&1\\ \end{bmatrix}\begin{bmatrix}1\\3\\5\\ \end{bmatrix}=\begin{bmatrix}a\\b\\c\\ \end{bmatrix}$

We know that,

$\begin{bmatrix}a&b&c\\d&e&f\\g&h&i\\\end{bmatrix}\begin{bmatrix}x\\y\\z\\\end{bmatrix}=\begin{bmatrix}ax+by+cz\\dx+ey+fz\\gx+hy+iz\\\end{bmatrix}$

So,

$a=-1\cdot1+2\cdot3+3\cdot5=-1+6+15=20$

$b=8\cdot1+(-4)\cdot3+0\cdot5=8-12=-4$

$c=6\cdot1+7\cdot3+1\cdot5=6+21+5=32$

So the solution is,

$a,b,c=\boxed{20,-4,32}$

Hope this helps :)

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