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X v For each situation, write a linear function model. Identify and interpret the following key features: domain, range, intercepts (if applicable), whether the function is increasing or decreasing, intervals where the function is positive or negative, extreme values, and end behavior (if applicable). 30. The combined pressure of the atmosphere and the water above a scuba diver changes as the diver descends, 0 as shown in the graph. g 32 (30, 28.0) 31. An electric model train travels continuously on a 24 closed loop of track at a constant speed of 2 . 2 164(10, 19.1) approximately 0.4 m/s. g o 32. The weight of a female elephant changes at a steady rate from 1 to 3 years of age. At 1 year of age, the elephant weighed approximately 332 Ib. At 3 years 0 10 20 30 of age, the elephant weighed approximately 826 Ib. Depth (ft)