There are 4 exams in a marking period. You received grades of 80, 65, and 72 on the first three exams. What is the MINIMUM grade you must earn on the last exam to get an average of no less than a 73 for the semester?

a.)the line for function b is steeper

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.