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5 September, 02:54

The daily lowest temperature, in degrees Fahrenheit, for a certain week are - 2, - 3, x, 2x, 4, 8. For the week, the sum of the temperatures was - 7°F. What is the value of x?

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Answers (2)
  1. 5 September, 03:16
    0
    -4.7

    Step-by-step explanation:

    -2 + (-3) + x + 2x + 4 + 8 = - 7

    -5 + 3x + 12 = - 7

    3x + 7 = - 7

    3x = - 14

    x = - 14/3 = - 4.7 °F

    The value of x is - 4.7.

    Check:

    -2 + (-3) + (-4.7) + 2 (-4.7) + 4 + 8 = - 7

    -5 - 4.7 - 9.3 + 12 = - 7

    -7 = - 7

    OK
  2. 5 September, 03:24
    0
    -14/9

    Step-by-step explanation:

    Combine - 2, - 3, x, 2x, 4, 8. We get - 5 + 3x + 12. This sum is - 7.

    Solve this equation for x: 3x + 7 = - 7, so 3x = - 14/3.

    Then x is - 14/9.
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