Mathematics, 30.11.2020 21:30, dndndndnxmnc

Why is 210 divided by 30 the same as 21 tens divided by 3 tens

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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.

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Why is 210 divided by 30 the same as 21 tens divided by 3 tens...