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4 December, 20:05

7=-2.7x^2+30x+6.5 round nearest 10th

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  1. 4 December, 21:28
    0
    0, 11.1 correct to the nearest tenth.

    Step-by-step explanation:

    7=-2.7x^2+30x+6.5

    2.7x^2 - 30x + 0.5 = 0

    Using the quadratic formula:

    x = [-30 + / - sqrt ((-30^2 - 4 * 2.7 * 0.5) ] / 5.4

    = 0.017, 11.094.
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