The number of tickets sold each day for an upcoming performance of​ Handel's Messiah is given by N= -0.4x^2+9.6x+14, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold that​ day?

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