The line graph shows the number of space shuttle launches by the United States from 1981 through 1986. 10
8
6
Number of launches
4
2
0
1981
1982
1985
1986
1983 1984
Time (year)
During which year of this time period was the number of space shuttle launches the greatest?

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

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.