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Anettt [7]
2 years ago
9

Pls help because I’m not sure

Mathematics
1 answer:
leva [86]2 years ago
8 0

B

Step-by-step explanation:

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Find the perimeter. Simplify your answer.
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30s-18 is the answer jus add all the sides together/ add the like terms then solve it
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Find the approximate solution of this system of equations. y=x^2+5x+3 y=square root2x+5
Anni [7]
We have that
y=x²<span>+5x+3
y=</span>√(<span>2x+5)

using a graph tool
see the attached figure

the solution is 
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y=2.156

therefore

the answer is the option
</span>B.) (-0.2, 2.1)

6 0
3 years ago
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The equilateral triangle has symmetry with respect to a line containing an altitude of the triangle
Gemiola [76]
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3 years ago
(08.05 MC)The following box plot shows the number of books sold each day at a bookstore for 40 days. How many days did the books
aalyn [17]

Considering the given box-and-whisker plot, it is found that the bookstore sold between 2 to 12 books in 20 days.

<h3>What does a box-and-whisker plot shows?</h3>

A box and whisker plot shows three things:

  • The 25th percentile, which is the median of the bottom 50%.
  • The median, which splits the entire data-set into two halfs, the bottom 50% and the upper 50%.
  • The 75th percentile, which is the median of the upper 50%.

From the plot given in this problem, the have that:

  • The 25th percentile is of 2.
  • The median is of 7.
  • The 75th percentile is of 12.

This means that the percentage of days in which between 2 to 12 books were sold is:

P = 75 - 25 = 50%.

Hence, out of 40 days, the amount of days is:

0.5 x 40 = 20 days.

More can be learned about box-and-whisker plots at brainly.com/question/27721471

#SPJ1

7 0
1 year ago
A data set includes 40 pulse rates of men, and those pulse rates have a mean of 67.3 beats per minute and a standard deviation o
Dafna11 [192]

Answer:

The 99% confidence interval of the  standard deviation of the pulse rates of men is  

       [ 7.949 \  \ , \  14.387 ]

Step-by-step explanation:

From the question we are told that

  The  sample size is  n  =  40

  The mean is  \= x  = 67.3 \  beats \  per \  minute

  The standard deviation is  s =  10.3 \ beats \ per \  minute

Generally the degree of freedom is mathematically represented as

     df =  n- 1

=>  df =  40- 1

=>  df =  39

From the question we are told the confidence level is  99% , hence the level of significance is    

      \alpha = (100 - 99 ) \%

=>   \alpha = 0.01

Generally from the chi distribution table the critical value  of   at a degree of freedom of is  

   X^2 _{\frac{\alpha }{2} , 39} =  65.476

Generally from the chi distribution table the critical value  of   at a degree of freedom of is  

   X^2 _{1- \frac{\alpha }{2} , 39} =  19.996

Generally the 99% confidence interval of the standard deviation of the pulse rates of men is mathematically represented as

  s \sqrt{\frac{n- 1}{X^2_{1- \frac{\alpha }{2} , n-1} } }\  \ , \ s \sqrt{\frac{n- 1}{X^2_{\frac{\alpha }{2} , n-1} } }

=>  10.3 \sqrt{\frac{40- 1}{65.476} }\  \ , \ 10.3 \sqrt{\frac{40- 1}{19.996} }

=>  [ 7.949 \  \ , \  14.387 ]

   

6 0
3 years ago
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