Help me please I don’t understand

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)

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

When is g(x) = 0 for the function g(x) = 5.23x + 4?