Due to acid rain, the percentage of lakes in Scandinavia that lost their population of brown trout increased dramatically between 1940 and 1975. Based on a sample of 2850 lakes, this percentage can be approximated by the following piecewise-linear function.

(a) Determine the percentage of lakes that lost brown trout by 1947 and by 1972. 

(b) Sketch a graph of f. 

(c) Is f a continuous function on its domain?

Transcribed Image Text:

f(x) = 1940) + 7 + 18 +18 (x-1960) 1960) if 1940 ≤ x < 1960 if 1960 ≤ x ≤ 1975