Question

o valor das letras do quadro de modo que as sequencias sejam diretamente proporcionais.

2 2,5 4 x
20 y z 8

Answer 1

$\dfrac{2}{20}=\dfrac{2,5}{y}=\dfrac{4}{z}=\dfrac{x}{8}$

$2y=20\cdot2,5~~\Rightarrow~~2y=50~~\Rightarrow~~\boxed{y=25}$

$\dfrac{2}{20}=\dfrac{4}{z}$

$2z=20\cdot4~~\Rightarrow~~2z=80~~\Rightarrow~~\boxed{z=40}$.

$\dfrac{2}{20}=\dfrac{x}{8}$

$20x=2\cdot8~~\Rightarrow~~20x=16~~\Rightarrow~~\boxed{x=0,8}$