Answer:
in total there are 80 subjects. I don't know what class width is though.
Step-by-step explanation:
Look at the graph
Answer:
30+(2x+7)+63=180(sum of angles of triangle )
30+2x+7+63=180
2x+100=180
2x=180-100
x=80/2
x=40
The answer is B when you subtract every like term
Take the cross product, then normalize the result.

This has norm

and so a unit vector orthogonal to both given vectors is

An equally correct answer would be the negative of this vector, since

.
Step-by-step explanation:
365.25days
1day=1440min
365.25days= 365.25×1440
=525960min.
as i guess.