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olchik [2.2K]
3 years ago
9

Ordinary quarters and a fake quarter with two heads are placed in a hat. One-quarter is selected at random and tossed twice. If

the outcome is "HH," what is the probability that an
ordinary quarter was selected?
Mathematics
1 answer:
motikmotik3 years ago
4 0
How many quarters of each are there?
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Answer:

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Step-by-step explanation:


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Factor the polynomial. 7x2 + 68xy - 20y2 A) (7x - 2y)(x + 10y) B) (7x - 10y)(x - 2y) C) (7x + 10y)(x + 2y) D) (7x + 2y)(x - 10y)
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For this case we have the following polynomial:
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 Answer:
 
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2 years ago
A swim team is divided into age groups: Guppies, stingrays, and sharks. There are 20 swimmers in the Stingray group. If we rando
ivanzaharov [21]

If you choose 10 swimmers and 4 are Stingrays, you can say that Stingrays make up roughly 40% of the swimmers. If 20 Stingrays make up 40% of all the swimmers, we just have to find what number 20 is 40% of. That’s easy enough by cross multiplication:

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