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Paha777 [63]
3 years ago
9

For what values of a are v = a i − j + k and w = a i + a j − 3 k perpendicular? give exact values.

Mathematics
1 answer:
nevsk [136]3 years ago
3 0
The vectors are perpendicular when their dot product is zero. That is
.. a^2 -a -3 = 0
.. (a -1/2)^2 -13/4 = 0
.. a = (1 ±√13)/2
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Answer:

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Step-by-step explanation:

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i.e. s = 0.3

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when n =100 this = 0.3 and

when n =400 this equals 0.15

We find that when sample size is four times as large as original, std deviation becomes 1/2 of the original

Correction option is

.b. It is one‐half as large as when n = 100.

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Answer:

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Step-by-step explanation:

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Preston has a car washing business. Last year he washed 20 cars a week. This year, he washed 1,200 cars. How many more cars did
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