Use a calculator to work these exercises. (See Examples 9 and 10.)Natural Science High con...

Use a calculator to work these exercises. (See Examples 9 and 10.)

Natural Science High concentrations of zinc ions in water are lethal to rainbow trout. The function

gives the approximate average survival time (in minutes) for trout exposed to x milligrams per liter (mg/L) of zinc ions.§ Find the survival time (to the nearest minute) for the given concentrations of zinc ions.

(a) 110

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(b) 525

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(c) 1960

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(d) 4500

§C. Mason. Biology of Freshwater Pollution, Addison: Wesley Longman, 1996.