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14 February, 07:40

The variable z is directly proportional to x. When x is 15, z has the value 165. What is the value of z when x = 25?

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Answers (2)
  1. 14 February, 09:52
    0
    275

    Step-by-step explanation:

    z is directly proportional to x:

    z = kx

    When x is 15, z is 165.

    165 = k * 15

    k = 11

    When x = 25:

    z = 11 * 25

    z = 275
  2. 14 February, 10:03
    0
    z=275

    Step-by-step explanation:

    it has a ratio 1:11

    that must be it
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