Use Figure 1.25 showing how the quantity, Q, of grass (kg/hectare) in different parts of Namibia depended on the average annual rainfall, r, (mm), in two different years.

Figure 1.25

Which of the two functions in Figure 1.25 has the larger difference quotient ΔQ∕Δr? What does this tell us about grass in Namibia?

Transcribed Image Text:

quantity of grass (kg/hectare) 6000 5000 4000 3000 2000 1000 1939 1997 100 200 300 400 500 600 rainfall (mm)