Silvia has completed 8 math exercises e. This one fourth of the assignment. How many exercises were assigned?

32

Step-by-step explanation:

since there are 4 parts, multiply 8 by 4

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.

combine all like terms then its just a 2 step equation