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f(1)=4 - 3.1 = 4 +(-3) = 1
f(8)=4 -3.8 = 4 +(-24) = 20
2.B.f(-4) = 4.-4 + 7 = -16 + 7 = 9
f(0) = 4.0 + 7 = 0 + 7 = 7
f(3) = 4.3 + 7 = 12 + 7 = 15