Answer:
c.
Step-by-step explanation:
Min Cost = $12,200
Number of buses needed = 7
Number of vans needed = 24
90 seats are on the right and 60 seats are on the left.
hi
-16t²+250 = 75
-16t² = 75 -250
-16t² = -175
t² = -175 /-16
t² = 175/16
Here there si two solutions : t =
and t = - 
However, as time cannot rewind, we will keep only positive solution
So t = 
in seconds it will be : 3.3 seconds
Two parallel lines are skew if they are not parallel but are in different planes, which means that they will not intersect, in spite of they are not parallel.