Answer:
A. 55:12
Step-by-step explanation:
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For the given vectors
and 
The dot product of vectors a and b is defined as = 
So, 

= -16+12
= -4
Answer:
x is 66 degrees
Step-by-step explanation:
since its a isosceles, two of the angles should be the same.
Answer:
f = (1/2)(m), for m = 1
f = (1/2)(1)
Step-by-step explanation: