b) Vértices: $\left(\frac-13,5\right)$ , $(1,5)$ , $(6,0)$ y $\left(\frac43,0\right)$ c) $F(-\frac13,5) = 5 \cdot \frac-13 + 3 \cdot 5 = \frac403$
$F(1,5) = 5 \cdot 1 + 3 \cdot 5 =20$
$F(6,0) = 5 \cdot 6 + 3 \cdot 0 =30$
$F(\frac43,0) = 5 \cdot \frac43 + 3 \cdot 0 = \frac203$
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