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TiliK225 [7]
3 years ago
5

Which expression is equivalent to 0.25(2d + 1) ? please help meh

Mathematics
2 answers:
wolverine [178]3 years ago
6 0

Answer:

I think it is 0.50d + 0.25

PLZ CORRECT ME IF I AM WRONG PLEASE AND THANK YOU

Step-by-step explanation:

Andreas93 [3]3 years ago
6 0

Answer:

Step-by-step explanation:

0.25 (2d+1)=

0.50d+0.25 <===

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What is the answer to -5+2=
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Step-by-step explanation:

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In a clinical study, volunteers are tested for a gene that has been found to increase the risk for a disease. The probability th
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Answer:

a) 0.984

b) 20 people

Step-by-step explanation:

a)

If The probability that a person carries the gene is 0.1, then in a sample of 20 people, 2 should carry the gene.

Now, we want to know how many samples there are with this property.

Since we have 20 elements where 18 are alike (do not carry the gene) and 2 are alike (carry the gene), we have to compute the number of permutations of 20 elements in which 18 are alike and 2 are alike. This number is

\frac{20!}{18!2!}=190

In this 190 20-tuples there are only 3 where the 2 carriers of the gene are in the first 3 places, namely

(1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)

(1,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)

(0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)

where 1=carries the gene, 0=does not carry the gene.

So there are 190-3 = 187 elements in which the first 3 elements have no 2 carriers, hence the probability that 4 or more people will have to be tested until 2 of them with the gene are detected is 187/190 = 0.984 (98.4%) rounded to three decimal places.

b)

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The sum of two numbers is x. If one of the numbers is 12, what is the other ?
Vlad1618 [11]
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If we want to find the other number, we need the make it into the subject

b = x - 12

Hope that help.
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