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Artyom0805 [142]
2 years ago
8

Ella simplifies (3 b + 4 r) + (negative 2 b minus r) and says the result is b Plus 5r. What error did Ella make? Ella incorrectl

y combined the b coefficients. The correctly simplified expression is 5 b + 5 r. Ella incorrectly combined the b coefficients. The correctly simplified expression is Negative b + 5 r. Ella incorrectly combined the r coefficients. The correctly simplified expression is b – 5r. Ella incorrectly combined the r coefficients. The correctly simplified expression is b Plus 3r.
Mathematics
2 answers:
zavuch27 [327]2 years ago
8 0

Answer:

Ella incorrectly combined the r coefficients. The correctly simplified expression is b Plus 3r.

Step-by-step explanation:

(3b+4r)+(-2b-r)

Open the bracket

=3b+4r-2b-r

Combine the like coefficient

=3b-2b+4r-r

=b+3r

Ella incorrectly combined the r coefficients. The correctly simplified expression is b Plus 3r.

yaroslaw [1]2 years ago
8 0

Answer:

Ella incorrectly combined the r coefficients. The correctly simplified expression is b Plus 3r.which is answer D.

Step-by-step explanation:

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The value is P (I |  L  )  =     0.63

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Step-by-step explanation:

From the question we are told that

   The percentage that are from outside the country is  P(O) =  0.70

    The  percentage that logs on everyday is  P(L) =  0.60

    The  percentage that logs on everyday that are from the inside the country is     P(L  |  I) =  0.80

Generally using Bayes' Rule the probability that a person is from the country given that he logs on the website every day is mathematically represented as

     P (I |  L  )  =  \frac{P(I)* P(L|I)}{ P(O) *P(L|O) + P(I) *P(L|I) }

Where  P(I) is the percentage that are from inside that country which is mathematically represented as

       P(I) =  1 -  P(O)

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      P(I) =  0.30

And P(L| O) is  percentage that logs on everyday that are from the outside  the country which is evaluated as

      P(L| O)  =  1-  P(L| I)

       P(L| O)  =  1-  0.80

       P(L| O)  = 0.20

P (I |  L  )  =  \frac{ 0.3* 0.80 }{ 0.7 *0.20 + 0.3 * 0.8 }    

P (I |  L  )  =     0.63

Given that the percentage that are from inside that country is  P(I) =  0.30

and that the probability that a person is from the country given that he logs on the website every day is  P (I |  L  )  =     0.63

We see that the additional information increased the probability

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