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3 years ago

Find the circumference, giving brainlies pls asap

Mathematics

2 answers:

Amanda [17]3 years ago

5 0

its a or b, sorry im not much help

zalisa [80]3 years ago

4 0

Answer:

B) 12.6π ; 39.6

Step-by-step explanation:

Circumference:

C = 2πr

C = 2(3.14)(6.3)

C = 6.28(6.3)

C = 39.6

C = 2πr

C = 2π6.3

C = 12.6π

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Question 61 pts Richard has been given a 12-question multiple-choice quiz in his history class. Each question has three answers,

Brut [27]

Answer:

0.946 = 94.6% probability that he will answer at least 2 questions correctly.

Step-by-step explanation:

For each question, there are only two possible outcomes. Either he answers it correctly, or he does not. The probability of answering a question correctly is independent of other questions. 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.

12 questions.

This means that $n = 12$

Each question has three answers, of which only one is correct.

This means that $p = \frac{1}{3} = 0.3333$

Assuming that Richard guesses on all 12 questions, find the probability that he will answer at least 2 questions correctly.

Either he answers less than 2 questions correctly, or he answers at least 2 questions correctly. The sum of the probabilities of these outcomes is decimal 1. So

$P(X < 2) + P(X \geq 2) = 1$

We want $P(X \geq 2)$ . So

$P(X \geq 2) = 1 - P(X < 2)$

In which

$P(X < 2) = P(X = 0) + P(X = 1)$

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

$P(X = x) = C_{12,0}.(0.3333)^{0}.(0.6667)^{12} = 0.008$

$P(X = x) = C_{12,1}.(0.3333)^{1}.(0.6667)^{11} = 0.046$

$P(X < 2) = P(X = 0) + P(X = 1) = 0.008 + 0.046 = 0.054$

$P(X \geq 2) = 1 - P(X < 2) = 1 - 0.054 = 0.946$

0.946 = 94.6% probability that he will answer at least 2 questions correctly.

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3 years ago

The function f(x) = 50(0.952)x, where x is the time in years, models a declining feral cat population. How many feral cats will

Eva8 [605]

Answer:

Step-by-step explanation:

Since we are given the function, we can simply plug in the x as 9. So we get 50(0.952)9. Solving this, we get 450(.952) and this is about 428. SO our answer is a) about 428 feral cats.

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4 years ago

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kvv77 [185]

Answer:

Step-by-step explanation:

3(100 - 2x) = 36x + 6

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7x = 49

x = 7.

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3 years ago

G-89/ -3 = -2 <br><br><br> WHAT IS G?

DIA [1.3K]

Answer:

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Step-by-step explanation:

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3 years ago

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Serggg [28]

Answer:

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Step-by-step explanation:

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hope this helped :)

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3 years ago