Answer:F(x)=5.1+0.8x has a greater value when x is 3.9 The difference is by 0.14
Step-by-step explanation: Plug 3.9 for x.
f(x)=5.1+0.8(3.9)= f(x)= 8.22
g(x)=3.4+1.2(3.9)=g(x)=8.08
8.22-8.08=0.14
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