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horrorfan [7]
3 years ago
12

Math Problem:

Mathematics
1 answer:
Masteriza [31]3 years ago
8 0

Answer:

i dont know

Step-by-step explanation:

I just need points go to this website m a t h w a y for help on any math :)

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Theresa Morgan, a chemist, has a 30% hydrochloric acid solution and a 50% hydrochloric acid solution. How many liters of each sh
Bogdan [553]
Let x represent the number of liters of 50% acid Theresa puts into the mix. The the number of liters of 30% acid will be (420-x). The total amount of acid in the final solution will be ...
  0.50x + 0.30(420-x) = 0.45(420)
  0.20x + 126 = 189 . . . . . . . . . . . . . . . simplify
  0.20x = 63 . . . . . . . . . . . . . . . . . . . . . subtract 126
  x = 63/0.20 = 315 . . . . . . . . . . . . . . . liters of 50% solution
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Theresa should mix ...
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3 years ago
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Verdich [7]
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2 years ago
The true probability of a baby being a girl is 0.475. What is the probability that at least one is a boy?
alex41 [277]

Answer:

The probability that at least one is a boy is 0.525

Step-by-step explanation:

P(Baby being a girl) = 0.475

Now, if A is any arbitrary event . Then:

as we know P(A)+ P(not A) = 1

⇒ P(A not happening)  = 1 - P(A event happening)

Also,  P( baby not being a girl) = P(baby being a boy)

So,  P(baby being a boy)  = 1 - P( baby being a  girl)

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Hence,  the probability that at least one is a boy is 0.525

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