1: As a result of global warming, the area covered by the ice cap on Mt. Kilimanjaro has decreased approximately linearly, from 12.1 km² in 1912 to 1.9 km² in 2007. a) Let t represent the number of years since 1910. Write the area of the ice, y, as a linear function of t. b) What does the y-intercept of this linear function represent in the context of this application? c) Assuming that the linear function you found in part a) continues, in what year will the ice cap disappear?

2. Researchers measuring skeletal maturity used a maturity score of 1 to 45 points, with 45 representing complete maturity. The average maturity score for the hip joint and pelvis of children of various ages (in years) is given in the table below.

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