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2 answers:
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Answer:
a)
Since the dot product is not equal to zero then the two vectors are not orthogonal.
If we replace we got:
Since the angle between the two vectors is 180 degrees we can conclude that are parallel
b)
Since the angle between the two vectors is not 0 or 180 degrees we can conclude that are either.
c)
Since the dot product is equal to zero then the two vectors are orthogonal.
Step-by-step explanation:
For each case first we need to calculate the dot product of the vectors, and after this if the dot product is not equal to 0 we can calculate the angle between the two vectors in order to see if there are parallel or not.
Part a
u=[-3,9,6], v=[4,-12,-8,]
The dot product on this case is:
Since the dot product is not equal to zero then the two vectors are not orthogonal.
Now we can calculate the magnitude of each vector like this:
And finally we can calculate the angle between the vectors like this:
And the angle is given by:
If we replace we got:
Since the angle between the two vectors is 180 degrees we can conclude that are parallel
Part b
u=[1,-1,2] v=[2,-1,1]
The dot product on this case is:
Since the dot product is not equal to zero then the two vectors are not orthogonal.
Now we can calculate the magnitude of each vector like this:
And finally we can calculate the angle between the vectors like this:
And the angle is given by:
If we replace we got:
Since the angle between the two vectors is not 0 or 180 degrees we can conclude that are either.
Part c
u=[a,b,c] v=[-b,a,0]
The dot product on this case is:
Since the dot product is equal to zero then the two vectors are orthogonal.
Answer:
2.25 divided by 0.6 : Yes and 5.2 divided by 8, 3.63 divided by 3, 71.1 divided by 9 : No
Step-by-step explanation:
We have that when two numbers are divided, they can be written in the form , where p is the dividend and q is the divisor.
Now, when we divide 5.2 by 8, we can write
Also, the division 3.63 by 3, can be written as = 1.21
Further, when we divide 71.1 by 3, we can write = 23.7
We can see that above divisions are easy divisions and do not require to write any type of 0 in the numerator.
Moreover, when we divide 2.25 by 0.6, we can write =
.
So, we get that in the last division, we need to write a zero in order to multiply the numerator with 10 for easy division.
Hence, 2.25 divided by 0.6 : Yes and 5.2 divided by 8, 3.63 divided by 3, 71.1 divided by 9 : No