Answer:
1 1/2
Step-by-step explanation:
because when you divide 7.5 by 5 you get 1.5

Parallel lines share the same slope, so the slope of the parallel line in this case must be
.
Point-slope form is
, where
is the slope and
is any known point on the line.
Plug in the values. 
Simplify and distribute. 
Subtract 1 from both sides. 
There are 9 seniors.
Although there are several ways of solving this problem, I just did what was easiest for me in my head. I divided 36 by 4, which gave me 9.
Its b because blue plus white is 16, so blue and white combined have the same as black
Hope this helps :D