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SCORPION-xisa [38]
4 years ago
9

Assuming that all matrices are n x n and invertible, solve for D .

Mathematics
1 answer:
alexdok [17]4 years ago
3 0
First multiply by C inverse on the leftC−1CBATDBCTA=C−1CB?
Yielding:BATDBCTA=BT

Then Multiply by B inverse and A transpose inverse on the left yielding
DBCTA=B−1A−TBT

Now, multiply by B inverse, C transpose inverse and A inverse on the right
D=B−1A−TBTB−1C−TA−1
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It is a 3-kilometer hike to the river PJ Walks for 500 then he walks another 1050 how many more kilometers must PJ walk to reach
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Total distance = 3km

Total distance left to walk  = 3km - 500m - 1050m
Total distance left to walk = 3000m - 500m - 1050m 
Total distance left to walk = 1450m
Total distance left to walk = 1.45km

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Answer: PJ needs to walk another 1.45km.
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5 0
3 years ago
PLEASE HELP:URGENT
trasher [3.6K]
The answer is C: 80 feet
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A rectangular field is twelve times as long as it is wide. If the perimeter of the field is 1690 feet, what are the dimensions o
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The width of the field is 65 feet.

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4 years ago
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abruzzese [7]

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Yeah....true. I neither like answers (especially math answers) without explanation and that's why i mostly don't answer math questions cuz what if the answer is wrong?

and i donth know how to explain math properly so yeah if u donth know donth answer it save it for the smarter or the ones who knows the answer well.

i can understand ur situation well cuz i have experienced it :)

6 0
3 years ago
PLEAS HELP ME
GarryVolchara [31]

\bf \qquad \qquad \textit{direct proportional variation} \\\\ \textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby \begin{array}{llll} k=constant\ of\\ \qquad variation \end{array} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ \stackrel{Table~A}{\begin{array}{ccll} x&y\\ \cline{1-2} 60&48\\70&56\\80&64 \end{array}}~\hspace{7em} \stackrel{Table~B}{\begin{array}{ccll} x&y\\ \cline{1-2} 20&24\\30&36\\40&48 \end{array}} \\\\[-0.35em] ~\dotfill


\bf \textit{for table A, we know that } \begin{cases} x=60\\ y=48 \end{cases}\implies 48=k60\implies \cfrac{48}{60}=k \\\\\\ \cfrac{4}{5}=k\qquad therefore\qquad \boxed{y=\cfrac{4}{5}x} \\\\\\ \textit{for table B, we know that } \begin{cases} x=30\\ y=36 \end{cases}\implies 36=k30\implies \cfrac{36}{30}=k \\\\\\ \cfrac{6}{5}=k\qquad therefore\qquad \boxed{y=\cfrac{6}{5}x}

4 0
3 years ago
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