Respuesta :

mhanifa

Answer:

  • 4.5

Step-by-step explanation:

z is directly proportional to x

  • z = kx, where k is coefficient

If z = 12 when x = 3

Then we have

  • 12 = 3k
  • k = 4

So the coefficient is 4

When z = 18, we have

  • 18 = 4x
  • x = 18/4
  • x = 4.5

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