Chapter 20, Problem 26P

The concentration of total phosphorus $\left(p{\text{ in mg/m}}^{\text{3}}\right)$ and chlorophyll a $\left(c{\text{ in mg/m}}^{\text{3}}\right)$ for each of the Great Lakes in 1970 was

	p	c
Lake Superior	4.5	0.8
Lake Michigan	8.0	2.0
Lake Huron	5.5	1.2
Lake Erie: West Basin Central Basin East Basin	39.0 19.5 17.5	11.0 4.4 3.8
Lake Ontario	21.0	5.5

The concentration of chlorophyll a indicates how much plant life is suspended in the water. As such, it indicates how unclear and unsightly the water appears. Use the above data to determine the relationship of c as a function of p. Use this equation to predict the level of chlorophyll that can be expected if waste treatment is used to lower the phosphorus concentration of western Lake Erie to 10 ${\text{mg/m}}^{\text{3}}$.