Does anyone understand Doubling?
Use the approximate doubling time formula (rule of 70) for the case described below. Gas prices are rising at a rate of 0.3% per month. What is their doubling time? By what factor will prices increase in 2 years? In 8 years?
What is it's doubling time in months?

no pictures of the graph

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.

add the numbers under frequency to find the total number:

5 + 8 +7 + 4 + 0 +1 = 25

the answer is 25.