Ten different letters of an alphabet are given. 2 of these letters followed by 2 digits are used to number the products of a company. in how many ways can the products be numbered

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The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

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.