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Math

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If m <DCE=4x+15 and m<ECF=6X-5 ,find m<DCE

  • Math -

    The angles are assumed to be complimentary(sum=90o).

    DCE + ECF = 90o
    4x+15 + 6x-5 = 90
    10x + 10 = 90
    10x = 80
    X = 8

    DCE = 4*8 + 15 = 47o

  • geometry -

    Álgebra if a supplement of an angle has a measure 78 less than the measure of the angle,what are the measures of the ángeles?

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