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vodomira [7]
2 years ago
12

Multiply: 85 x 4 = 340

Mathematics
2 answers:
Ghella [55]2 years ago
4 0

Answer:

Yes

Step-by-step explanation:

85 x 4 is equal to 340.

SpyIntel [72]2 years ago
3 0

Answer:

840

Step-by-step explanation:

Yes I agree

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Investment is a source of income.

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On a multiple choice test with 15 ​questions, each question has four possible​ answers, one of which is correct. For students wh
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Answer:

The variance for the number of correct answers is 2.8 questions

Step-by-step explanation:

The number of correct answers follows binomial distribution, in which we have:

  • n identical and independents events: the 15 questions
  • two possibles results that we call success and fail: The answer is correct and the answer is incorrect
  • probability p of success and 1-p of fail. Probability 1/4 of get the answer correct and probability of 3/4 of get the answer incorrect. This probabilities are calculated on that way because every question have 4 possible answers and one of which is correct.

So, the variance for a variable x that follows a Binomial distributions is:

V(x)=n*p*(1-p)

Then, the variance for the number of correct answers is:

V(x)=15*(1/4)*(3/4) = 2.8125 ≈ 2.8

Because n is equal to 15, p is equal to 1/4 and (1-p) is equal to 3/4.

5 0
3 years ago
Is the system of equations is consistent, consistent and coincident, or inconsistent? y=−x+12y=−2x+2 Select the correct answer f
Dmitriy789 [7]

Answer: A consistent system has at least one solution. ... y = 7/3 * x - 2/3 is the slope intercept form of the equation 7x - 3y = 2 m = 7/3 b = -2/3 a line parallel to the line created by this equation.




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Of the 50 students in the cafeteria, 7 have red hair. Suppose there are 750 students in the school. Write a proportion that coul
gulaghasi [49]

Given:

Of the 50 students in the cafeteria, 7 have red hair.

Total number of students = 750

To find:

The proportion that could be used to predict the number of students who have red hair.

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Let x represent the number of students who have red hair.

The ratio of student having red hair to the total number of students are

Ratio_1=\dfrac{7}{50}

Ratio_2=\dfrac{x}{750}

The number of students having red hair is proportional to the total number of students. So, the above ratios are equal.

\dfrac{x}{750}=\dfrac{7}{50}

Multiply both sides by 750.

\dfrac{x}{750}\times 750=\dfrac{7}{50}\times 750

x=7\times 15

x=105

Therefore, the required equation is \dfrac{x}{750}=\dfrac{7}{50} and the number of students who have red hair is 105.

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3 years ago
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