Respuesta :

akingbadeadeniji

Answer:

15

Step-by-step explanation:

[tex]using \: \: \: \: inverse \: \: variation[/tex]

  • Z=kX where k is constant
  • make k subject of the formula then, k=Z/X
  • for k=Z1/X1=Z2/X2
  • Z1=30, X1=8, Z2=?, X2=4

30/8=Z2/4

  • cross multiply

Z2=(30×4)/8

Z2=120/8

Z2=15