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18 September, 03:35

A computer can sort x objects in t seconds, as modeled by the function below:

t=0.005x^2+0.002x

How many objects are required to keep the computer busy for exactly 9 seconds?

Round to the nearest whole object.

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  1. 18 September, 04:08
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    T = 9 = 0.005x^2 + 0.002x

    0.005x^2 + 0.002x - 9 = 0

    To solve this quadratic equation divide by 0.005

    x^2 + 0.4x - 1800 = 0

    x = {-b + / - √[b^2 - 4ac] } / 2a = {-0.4 + / - √[0.16 + 7200]} / 2 = { - 0.4 + / - 84.85}/2 =

    Use only the positive result: x = 42.2 = 42

    Answer: 42
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