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8 December, 11:28

Which value of a from the set {16, 18, 20, 22} makes the equation

2 (42 - a) = 48 true?

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  1. 8 December, 14:48
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    a is equivalent to 18.

    2 (42 - a) = 48

    2 (42) + 2 (-a) = 48 * distributive property of multiplication

    84 - 2a = 48

    -2a = 48 - 84

    -2a = - 36

    -2a/-2 = - 36/-2

    a = 18

    to check:

    2 (42-a) = 48

    2 (42-18) = 48

    2 (24) = 48

    48 = 48
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