Suppose you have a bag containing two red marbles, two blue marbles, and two white marbles. You choose two marbles without looking. What is the probability that you will choose a red marble and then a blue marble without replacing the red one?
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I’m stuck on this equation, anyone got the answer?

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.

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry