the mean of three numbers is four what is the missing number the two that are shown are 1 and 9 help

Question

the mean of three numbers is four what is the missing number
the two that are shown are 1 and 9
help

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Khải Quang 19 hours 2021-07-21T13:23:52+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-07-21T13:25:02+00:00

    (1+9+x)/3=4 thus 10+x=12 x=2 number is 2

    0
    2021-07-21T13:25:31+00:00

    Answer:

    the answer is 2

    Step-by-step explanation:

    1+2+9=12

    12/3 = 4

    mean = average and the average is 4

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )