Answer:
30 Edges.
Step-by-step explanation:
Euler's formula tells us that 
(Vertices - edges + faces = 2).
Plug the numbers in:
Solve:
Therefore, there are 30 edges.
Answer:
1
Step-by-step explanation:
I put it in a calculator like -2(-3)-5 so I removed the x and put -3
Given that "Jane wrote all the natural numbers from 5 to k. Including 1 and k"
So Jane wrote k numbers.
lets take an example
if k = 10 , then natural numbers between 1 and 10 are 10 numbers that are 1 , 2 , 3 ,4 ,5 ,6 , 7 , 8 ,9 and 10.
Hence she write k numbers.
ANSWER
A) v1 is not perpendicular to v2
EXPLANATION
Two non-zero vectors are orthogonal or perpendicular if their dot product is zero.
In other words,if two non-zero vectors are not orthogonal or perpendicular then their dot product is not equal to zero.
From the question v1 and v2 are non-zero vectors and their dot product is not equal to zero.
This tells us that, the two vectors are not perpendicular.
The correct choice is A.
