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3 years ago

PLS HELP WITH THIS ONE

Mathematics

1 answer:

olga2289 [7]3 years ago

4 0

Answer:

460 ft^2 of carpet will be replaced

Step-by-step explanation:

You need to find the area of the room and then take away the area of the six bookcases

Area of the room

20*20=400ft^2

35-20=15ft

(15*20)/2=150ft^2

400+150=550ft^2 total room area

Area of bookcases

2.5*6*6=90ft^2 total bookcase area

room area - bookcase area = carpet area

550-90=460ft^2

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What percentage of total hours was spent playing soccer

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Answer: You need to give more information for me to able to properly answer this question.

Step-by-step explanation:

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3 years ago

Hunter raises beetles. in a square of compost 6 ft by 6 ft, he can have 500 beetles. how many beetles can he have if his square

Rus_ich [418]

If Hunter raises beetles in a square of compost with a size of 6 ft by 6 ft and having 500 beetles, and then you are to find the number of beetles with a side length that is four times longer, then you can solve this by ratio and proportion.

A = s²
A = 6²
A = 36 ft²

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A = 24²
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4 years ago

A line passes through the points (4,9) and (12,20) what is the slope of the line?

ad-work [718]

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8 0

3 years ago

Read 2 more answers

1.44 Make-up exam: In a class of 28 students, 27 of them took an exam in class and 1 student took a make-up exam the following d

Olenka [21]

Answer:

a) Decrease

b) New mean = 78.43

c) Decrease

Step-by-step explanation:

We are given the following in the question:

Total number of students in class = 28

Average of 27 students = 79

Standard Deviation of 27 students = 6.5

New student's score = 63

a) The new student's score will decrease the average.

b) New mean

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean = \dfrac{\displaystyle\sum x_i}{27} = 79\\\\\sum x_i = 27\times 79 = 2133$

New mean =

$\text{ New mean} =\dfrac{ \displaystyle\sum x_i +63}{28}\\\\ =\dfrac{2133+63}{28}= \dfrac{2196}{28} = 78.43$

Thus, the new mean is 78.43

c) Since the new mean decreases, standard deviation for new scores will decrease.

This is because the new value is within the usual values i.e. within two standard deviations of the mean. So, this wont cause a lot of variation as this value will be closer to already available data values. Also number of observations (n) in the denominator is increasing. Based on both these points we can conclude that standard deviation will decrease

Formula for Standard Deviation:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n}}$