A plane contains 11 horizontal lines and 11 vertical lines. These lines divide the plane into disjoint regions.
How many of these disjoint region's have a finite,
nonzero area?
A. 100
B. 110
C. 144
D. 156
E. 169

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality