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Amiraneli [1.4K]
4 years ago
10

For a school play, the teacher asked the class to set up chairs in 20 rows with 25 chairs in each row. After setting up all the

chairs, they were 5 chairs short. How many chairs did the class set up
Mathematics
2 answers:
Dimas [21]4 years ago
8 0
The answer is 495 chairs. this is because the 20 rows x 25 chairs in each row=500 total chairs. if they were 5 shorts you have to subtract 5 from 500 which is 495 chairs.
pantera1 [17]4 years ago
6 0
20 rows * 25 chairs=500 chairs
500-5=495
Answer=495
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Rasek [7]

(5x^3-3x^2+5)+(-2x^3+6x^2-5)\\\\=(5x^3-2x^3)+(-3x^2+6x^2)+(5-5)\\\\=\boxed{3x^3+3x^2}

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3 years ago
I am really confused with this question.
klemol [59]
It would be A or B
but not D,C
7 0
3 years ago
Read 2 more answers
RIGHT ANSWERS ONLY I REALLY NEED TO PASS IF YOUR FAST AND CORRECT ILL GIVE YOU BRAINEST!!!
malfutka [58]

Answer:

1st option

Step-by-step explanation:

The domain and range are all real numbers , that is

domain { x | x ∈ R }

range { y | y ∈ R }

6 0
3 years ago
The mean percentange of a population of people eating out at least once a week is 57℅
Sidana [21]

Answer:

<u>The correct answer is B. between 56.45% and 57.55% </u>

Complete statement and question:

The mean percentage of a population of people eating out at least once a week is 57% with a standard deviation of 3.50%. Assume that a sample size of 40 people was surveyed from the population a significant number of times. In which interval will 68% of the sample means occur?

between 55.89% and 58.11%

between 56.45% and 57.55%

between 56.54% and 57.46%

between 56.07% and 57.93%

Source: brainly.com/question/1068489

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Mean percentage of a population of people eating out at least once a week  = 57%

Standard deviation = 3.5%

Sample size = 40

Confidence level = 68%

2. In which interval will 68% of the sample means occur?

For answering this question, we should find out the standard deviation of the sample, using this formula:

Standard deviation of the sample = Standard deviation of the population/√Sample size

Standard deviation of the sample = 3.5/√40

Standard deviation of the sample = 3.5/6.32

Standard deviation of the sample = 0.55

Let's recall that a confidence level of 68% means that 68% of the sample data would have a value between the mean - 1 time the standard deviation of the sample and the mean  + 1 time the standard deviation of the sample. Thus:

57 - 1 * 0.55 = 57 - 0.55 = 56.45

57 + 1  * 0.55 = 57 + 0.55 = 57.55

<u>The correct answer is B. between 56.45% and 57.55% </u>

7 0
3 years ago
Applying the Third Corollary to the Inscribed Angles Theorem A circle is shown. Points A, B, C, and D are on the circle. Lines c
Marat540 [252]

Answer:

  • ∠B = 110°
  • ∠D = 70°

Step-by-step explanation:

Opposite angles in an inscribed quadrilateral are supplementary, so ...

  ∠B +∠D = 180°

  (3x -4) +(2x -6) = 180

  5x = 190 . . . . . . . . . . . add 10, collect terms

  x = 38 . . . . . . . . . . . . . divide by 5

  ∠D = 2(38) -6 = 70

  ∠B = 180 -70 = 110

The measures of angles B and D are 110° and 70°, respectively.

8 0
4 years ago
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