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4.1.41 8 of 8 (7 complete) The function T(x)=0.15(x - 3000) + 300 represents the tax bill of a single person whose adjusted gross income is x dollars for income between $3000 and STT 200 inclusive (a) What is the domain of this linear function? (b) What is a single filer's tax bill if the adjusted gross income is $12,000? (c) Which variable is independent and which is dependent? (d) Graph the linear function over the domain specified in part (a) (e) What is a single filer's adjusted gross income if the tax bill is $3975