Select the correct answer from each drop-down menu.
the general form of the equation of a circle is 7x^2 + 7y^2 − 28x + 42y − 35 = 0.
the equation of this circle in standard form is . the center of the circle is at the point , and its radius is units.

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