a) f(12.6) = 0.08(12.6) + 4.02
f(12.6) = 1.008 + 4.02
f(12.6) = 5.028
b) f(-1.09) = 0.08(-1.09) + 4.02
f(-1.09) = -0.0872 + 4.02
f(-1.09) = 4.1072
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