3 years ago

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Mathematics

1 answer:

antiseptic1488 [7]3 years ago

5 0

The answer to your question is .........

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Compute a · (b ✕ c), where a = i − 3j + k, b = 4i + j + k and c = 9i − j + 3k.

grandymaker [24]

$\mathbf a=\mathbf i-3\,\mathbf j+\mathbf k$
$\mathbf b=4\,\mathbf i+\mathbf j+\mathbf k$
$\mathbf c=9\,\mathbf i-\mathbf j+3\,\mathbf k$

$\mathbf b\times\mathbf c=\begin{vmatrix}\mathbf i&\mathbf j&\mathbf k\\4&1&1\\9&-1&3\end{vmatrix}=4\,\mathbf i-3\,\mathbf j-13\,\mathbf k$

$\mathbf a\cdot(\mathbf b\times\mathbf c)=(\mathbf i-3\,\mathbf j+\mathbf k)\cdot(2\,\mathbf i-3\,\mathbf j-13\,\mathbf k)=4+(-3)^2-13=0$

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3 years ago

What is √117 simplified

kenny6666 [7]

Answer:

10.82

Step-by-step explanation:

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A pair of shoes costs $25 to make. This means that you need to charge a price of at least ___ just to cover your cost.

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I believe the answer is $50.

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Adding &subtracting x-60=20

Alex777 [14]

Just add to find X
20 + 60 = 80
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X = 80
To make sure plug it in
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2 years ago

You invest $1000 in an accound that pays 7.9% interest, compounded monthly. How much money is in the account at the end of three

faust18 [17]

Answer:I hope the following example will help you

Step-by-step explanation:

Ex1: If $1000 is invested now with simple interest of 8% per year. Find the new amount after two years.

P = $1000, t = 2 years, r = 0.08.

A = 1000(1+0.08(2)) = 1000(1.16) = 1160

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