The elevation of city a is 80 feet below sea level; the elevation of city c is 16 feet below sea level. the elevation of city d is 1 over 2 of the elevation of city c. part a: write an expression to represent the elevation, in feet, of city d. (5 points) part b: solve the expression and explain why the answer is negative or positive. (5 points)

A.The elevation of city D= feet  

B.The elevation of city D=-8 feet

because it is 8 feet below the sea level therefore, it takes  negative.

Step-by-step explanation:

We are given that

The elevation of city A=-80 feet

The elevation of city C=-16

The elevation of city D=1 over 2 of the city C

A.We have to find an expression to represent the elevation in feet of city D.

The elevation of city D= feet  

B.We have to solve the expression and explain .

The elevation of city D=

The answer is negative because the elevation is below the sea level.

The sea level is like as origin and the elevation measured on the negative y- axis below the origin means sea level.

So, the elevation of city D is 8 feet below the sea level and taken -8.

c

step-by-step explanation:

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.