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Neko [114]
3 years ago
11

Xiomara bought 3 books that each cost the same amount and a magazine for a total of $27. If the magazine cost $3, then how much

was each book? Write an equation and solve.
Mathematics
2 answers:
pychu [463]3 years ago
7 0

$7 is 1/6 of 3/7 of Bella's money, so she had $98 to start with. 4/7 of 98 is $56, as you figured.

The dictionary and the books cost 56

d+3b = 56

3/8 d = 1/2 * 3b

so, 3d = 12b

4b + 3b = 56

b = 8

check:

3 books cost 24

dictionary cost 32

3/8(32) = 1/2(24)

12=12

skelet666 [1.2K]3 years ago
4 0

Answer:$8

Step-by-step explanation:

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1.<br> (k — 7)(k – 1) =<br> 0
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(7-7)(7-1)=0

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I need help with the photo below.
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3 0
3 years ago
10. A company finds that 45% of first-time visitors to its website do not buy any of its products. If there are 75 first-time vi
vekshin1

Using the binomial distribution, it is found that the probability that exactly 36 of them buy a product is of 0.044.

For each first-time visitor, there are only two possible outcomes, either they buy a product, or they do not. The probability of a first-time visitor buying a product is independent of any other first-time visitor, hence the binomial distribution is used to solve this question.

<h3>What is the binomial distribution formula?</h3>

The formula is:

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

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

The parameters are:

  • x is the number of successes.
  • n is the number of trials.
  • p is the probability of a success on a single trial.

In this problem:

  • 45% of first-time visitors to its website do not buy any of its products, hence 55% buy, that is, p = 0.55.
  • There are 75 first-time visitors on a given day, hence n = 75.

The probability that exactly 36 of them buy a product is P(X = 36), hence:

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

P(X = 36) = C_{75,36}.(0.55)^{36}.(0.45)^{39} = 0.044

More can be learned about the binomial distribution at brainly.com/question/24863377

8 0
2 years ago
Given the following formula, solve for n. S = (n − 2)180
sweet [91]

Answer: B

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
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