Answer:
(c)
"The given statement is true, by definition of length of a vector
,
"
Step-by-step explanation:
(a) 
That is completely correct Remember that if
then

Therefore the correct answer would be (c).
"The given statement is true, by definition of length of a vector
,
"
Answer:
B
Step-by-step explanation:
The answer is B
Answer:
x=21−7y?
Step-by-step explanation:
I don't really know what else to do