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Zepler [3.9K]
3 years ago
14

A bag contains ten marbles of equal size and weight. One marble is blue, one marble is white, three are yellow, and five marbles

are red. A marble is taken from the bag two times. Each time a marble is taken out, it is not replaced. What is the probability of picking a red marble and picking a red marble?
A) 1/4

B) 2/9

C) 9/10

D) 7/45
Mathematics
1 answer:
Paul [167]3 years ago
3 0

Answer:

B) 2/9

Step-by-step explanation:

First, the probability of picking a red marble is 5/10, which is the same as 1/2. This is because there are 5 marbles in the bag that are red out of the 10 total marbles. Then, because we don't replace the marble, there are now 9 total marbles, with 1 blue, 1 white, 3 yellow, and 4 red. Now the probability of picking a red marble is 4/9.

Multiplying these two probabilities together gives you the probability of picking 2 red marbles in a row, which is 1/2 * 4/9 which is equal to 4/18, or 2/9 when simplified.

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Answer:

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Calculation:

\ln \dfrac{24}{20} =0.000 11t\\\\\ln 1.2 = 0.000 11t\\\\0.1823 = 0.000 11t\\\\t = \dfrac{0.1823}{0.000 11} = \textbf{1700 yr}\\\\\text{It will take } \boxed{\textbf{1700 yr}}\text{ for the polonium to decay to 20 g}

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How do you put 943,261,586 with base ten numbers
Citrus2011 [14]

Answer:

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Step-by-step explanation:

How do you put 943,261,586 with base ten numbers

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(9 \times 10^{8}) + (4 \times 10^{7}) + (3 \times 10^{6}) + (2 \times 10^{5}) +  (6 \times 10^{4}) +  (10^{3}) +  (5 \times 10^{2}) +  (8 \times 10) + (6 \times 10^{0})

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