Answer:
One
Step-by-step explanation:
A, B, R and C lie on the same plane, while the others do not
Answer:
19/20 of a mile.
Step-by-step explanation:

The common denominator is 20 so we times the first one by 2 the second one by 5 and the last one by 4. (Both numerator and denominator.)
You will end up with this 
Step-by-step explanation:
questions 8, obviously the mid part of the parabola is 3, that is the axis of symmetry.
question 9, only one solution because you only have one parabola.