A researcher plants three plots of flower seeds. He weeds and waters the first plot every day. He weeds and waters the second plot every other day. He leaves the third plot alone. After 12 weeks, the researcher measures the height of each flower. What is the role of the plots of flowers in the experiment?

M? aoc=96 ? space, m, angle, a, o, c, equals, 96, degree \qquad m \angle boc = 8x - 67^\circm? boc=8x? 67 ? space, m, angle, b, o, c, equals, 8, x, minus, 67, degree \qquad m \angle aob = 9x - 75^\circm? aob=9x? 75 ? space, m, angle, a, o, b, equals, 9, x, minus, 75, degree find m\angle bocm? bocm, angle, b, o, c: