Isaac Newton’s Theory of Gravitation proved that gravity behaves as a rational function, which can be modeled as:
g = μ/r^2
Where g is the strength of gravity in m/s^2, μ is the “standard gravitational parameter,” which is
3.986*10^14 for Earth, and r is the radial distance from the center of the planet measured in
meters. Earth has a radius of 6378 km.

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