Christina read an 80-page book in one evening. She read for 3/4 number of an hour before dinner and then read the rest of the book in 1 3/4 hours after dinner. What was the average number of pages per hour that Christina read?

A.32
B.40
C.160
D.200

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