A box contains 20 red marbles and 30 blue marbles. A second box contains 10 white marbles and 40 black marbles. If you choose on
e marble fra
each box without looking, what is the probability that you get a blue marble and a black marble?
each box without looking, what is the probability that you get a blue marble and a black marble?
1 answer:
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Answer:
1. 25
2. 9
Step-by-step explanation:
If I'm correct, to complete the square you need to use
So, for #1, b is 10. = 5.
= 25.
For #2, b is -6. = -3.
= 9.