There are 10 marbles in a bag, and the marbles are either red or blue. Eric will randomly choose two marbles from the bag, witho
ut replacing the first one. How many BLUE marbles are in the bag given that the probability of both marbles will be red is 2 15 ?
2 answers:
Answer:
6 blue marbles
Explanation:
(red / 10) * (red minus one / 9)
r(r-1)/90
2/15 = 12/90
r(r-1)/90 = 12/90
r² - r = 12
r² - r - 12 = 0
(r + 3)(r - 4) = 0
r = -3 or r = 4
red = 4; blue = 6
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Hello there.
<span>Which of the following states was formed by continuous volcanic lava flow?
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Hawaii
People live in mud or stone one-room houses
Explanation:
because in rural village we cannot find it
It includes steep mountains like the Andes
