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The length of a spring is a linear function of the mass of the object hanging from it. For a particular spring, the length was 12 centimeters when a 2-kg mass was attached to it. When a 5-kg mass was hung from it, it stretched to a length of 18 cm. How much mass must be hung from this spring for it to stretch to 25 cm?

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  1. d = k x + b by the way b is un stretched length
    12 = 2 k + b
    18 = 5 k + b
    ----------------- subtract
    -6 = -3 k
    k = 2 then b = 8
    25 = 2 m + 8

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