Two angles are supplementary with measures m acb=4x degrees and m bcd= (6x+50) degrees. what is the measure of acb?

Supplementary angles add up to 180 degrees. Therefore, we can set up the equation:

m ACB + m BCD = 180

4x + (6x+50) = 180

10x + 50 = 180

10x = 130

x = 13

Therefore, the measure of ACB is:

m ACB = 4x = 4(13) = 52 degrees