Researchers at Iowa State University and the University of Arkansas have developed a piecewise function that can be used to estimate the body weight (in grams) of a male broiler during the first 56 days of life according to

where t is the age of the chicken (in days). (A broiler is a chicken raised for meat purposes.).

(a) Determine the weight of a male broiler that is 25 days old.
(b) Is W(t) a continuous function?
(c) Use a graphing calculator to graph W(t) on [1, 56] by [0, 3000]. Comment on the accuracy of the graph.

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W(t) = 483.64t+ 0.6363t² + 0.00963t³ if 1 ≤ t ≤ 28, -100465.8t if 28 < t ≤ 56,