3 years ago

The weighted-average method is best used for

Mathematics

1 answer:

Tresset [83]3 years ago

8 0

D. Homogeneous products

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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

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Evgen [1.6K]

The answer is 73.81 :))

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2 years ago

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Find the 13 term<br>7 la For the sequence 11,13,15,17

zaharov [31]

Well i don’t understand your question but the pattern is infinitely (+2) the next 3 terms are 19,21,23

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