Answer:
16
Step-by-step explanation:
1/2 is equal to 8/16
For the given vectors
and 
The dot product of vectors a and b is defined as = 
So, 

= -16+12
= -4
Y=mx+b now just re do them
Answer:
10%
Step-by-step explanation:
The multiples of 2 are 2,4,6,8,10, and so on
The multiples of 5 are 5, 10, 15, 20 , 25, and so on
It is evident that the only one that matches up between 1-10 is 10.
There are 10 options, and our chances are random. There is only 1 option for it to be a multiple of both 2 and 5. Therefore, the probability is 1/10, or 10%