Kepler spent 1/5 of his savings, and Carl spend 5/9 of his savings. If they both started with the same amount of money in their savings accounts, which of the following shows the best method to find a good estimate of how much more Carl spent than Kepler?

What is the volume of the sphere shown below with a radius of 3?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

Which of the following can be used to explain a statement in a geometric proof?