Answer:
Part a) 
Part b) 
Part c) Standard Daily Rate plus Mileage plan
Step-by-step explanation:
Part a) What would be the cost of the Standard Daily Rate plus Mileage plan?
Let
y ----> the total cost
x ----> the number of kilometers
we have that
For a Luxury car

For x=400 km
substitute


Part b) What would be the cost of the Unlimited Mileage plan?
we know that
The Unlimited Mileage plan for a Luxury car is $105 per day (see the table)
The trip are three days
so
To find the total cost multiply $105 by 3

Part c) Which is the better plan?
Compare

therefore
For this trip the better plan is the Standard Daily Rate plus Mileage plan
A) AB is where plane P and plane R intersect.
B) A, D, B are collinear (on the same line).
C) plane ADG (three points on the plane)
D) F, D, G, A are all on plane R
E) D lies on both planes.
Answer: Yes, because the amount of money you save for every beverage bought is constant, and if you buy 0 beverages, you’ll save $0. That means it the situation is graphed, the line produced will be linear and crosses through the origin, which are the requirements for a proportional relationship.