Critical thinking the weight y (in pounds) of a rainbow trout can be modeled by y = 0.000304x3, where x is the length (in inches) of the trout. a. write a function that relates the weight y and length x of a rainbow trout when y is measured in kilograms and x is measured in centimeters. use the fact that 1 kilogram ≈ 2.20 pounds and 1 centimeter ≈ 0.394 inch.