Question

This graph shows a model of food energy production, per person, in the United States from the year 1960 to the year 2010.

Answer 1

So the question is: What is the slope of that line? There is a 10 billions of joules increase in 50 years, then how do we find out how many billions of joules per year?

Answer 2

So is it c?

Answer 3

No. I did 10/50 = .2 right?

Answer 4

Ok but how did you do it? you just did the fraction thing?

Answer 5

Yup, just the fraction. I looked at the graph to see the highest and lowest values and then subtract them.