tomasfeliperq tomasfeliperq

15-09-2021
Mathematics

contestada

if z varies directly as x , and z =30 wnhen x =8,find z when x=4

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akingbadeadeniji akingbadeadeniji

15-09-2021

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

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