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zvonat [6]
3 years ago
5

Which of these numbers is in the solution set of x + 5 = 15? A. 10 B. 3 C. 20 D. 11

Mathematics
2 answers:
stealth61 [152]3 years ago
6 0

Answer:

A

Step-by-step explanation:

10 + 5 = 15

Alik [6]3 years ago
3 0

Answer: A

Step-by-step explanation:

x+5=15

  -5  -5

x=10

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Add 2 to both sides:
5x = pm\sqrt{15} + 2

Divide both sides by 5:
x =  \dfrac{ \pm\sqrt{15} + 2}{5}

Answers:
x = \dfrac{ \sqrt{15} + 2}{5} \ or \ \dfrac{ - \sqrt{15} + 2}{5}

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Answer:

B) 0.287

Step-by-step explanation:

For each Coffeeton resident, there are only two possible outcomes. Either they recognize the brand name, or they do not. The probability of a resident recognizing the brand name is independent of other residents. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

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This means that p = 0.53

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This is P(X = 4) when n = 7. So

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P(X = 4) = C_{7,4}.(0.53)^{4}.(0.47)^{3} = 0.287

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B) 0.287

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