The current number of coupons being mailed out by a company each week in one region of the country can be represented by the function R(x) = 3x2 + 21x, where x is the number of cities in the region. The number of coupons in a new mailing sent only to preferred customers can be represented by the function P(x) = 9x. Which function best describes C(x), the number of coupons that are shipped out in any given week?

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