Question

40 PONTOS!! Me ajudem nessas questões pfvvv

Answer 1

Sólido I:

$V = (3x + 1)(x)(2x) = (3 {x}^{2} + x)(2x)\implies \\ \\ V =6 {x}^{3} + 2 {x}^{2}$

Sólido II

$V = (x + 1)(x)(x + 3) = ({x}^{2} + x)(x + 3)\implies \\ \\ V = {x}^{3} + {x}^{2} + 3 {x}^{2} + 3x$