An environmentalist measures the concentration of pollutants in a number of ponds in a region. She estimates the numbers of a
species of frog in each case, and finds a negative correlation between the pollutant concentration and the number of frogs per
unit area
Which statement BEST describes why the investigation is an observational study?
03-))
A)
There is only one independent variable in the study
B)
The researcher does not set the values of the independent variable.
It is not possible to set the concentration of pollutants in a sample of
water
D)
The researcher estimates the numbers of frogs, instead of counting them
directly
Collect Data
(MSRC Study Design And Scope

Answer:

84%

Step-by-step explanation:

of the means division.

42/50 = 84/100 = 84%

The percentage of the dirty coffee mugs at the pancake house will

be 84%.

What is mean by Percentage?

A number or ratio that can be expressed as a fraction of 100 or a relative value indicating hundredth part of any quantity is called percentage.

To Calculate the percent of a number , divide the number by whole number and multiply by 100.

Given that;

Total number of coffee mugs = 50

Dirty coffee mugs = 42

Now,

The  percentage of the dirty coffee mugs at the pancake house is calculated as;

Percent = 42 / 50 x 100

            = 0.84 x 100

            = 84%

Thus, The percentage of the dirty coffee mugs at the pancake house will

be 84%.

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The correct statement is to Prove that opposite sides are congruent and that the slopes of consecutive sides are opposite reciprocals.

A quadrilateral is a polygon with 4 number of sides and 4 vertices. A few examples of a quadrilateral are square, rectangle, rhombus, parallelogram, etc.

The statement that explains how you could use coordinate geometry to prove that quadrilateral ABCD is a parallelogram is "Prove that opposite sides are congruent and that the slopes of consecutive sides are opposite reciprocals".

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Using the normal distribution, it is found that there is a 0.84 = 84% probability that a randomly selected high jumper has a personal best between 227 and 265 cm.

The z-score of a measure X of a normally distributed variable with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex] is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

In this problem, the mean and the standard deviation are given, respectively, by:

[tex]\mu = 208, \sigma = 19[/tex]

The probability that a randomly selected high jumper has a personal best between 227 and 265 cm is the p-value of Z when X = 265 subtracted by the p-value of Z when X = 227, hence:

X = 265:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{265 - 208}{19}[/tex]

Z = 3

Z = 3 has a p-value of 0.9987.

X = 227:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

[tex]Z = \frac{227 - 208}{19}[/tex]

Z = 1

Z = 1 has a p-value of 0.1587.

0.9987 - 0.1587 = 0.84.

0.84 = 84% probability that a randomly selected high jumper has a personal best between 227 and 265 cm.

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Answer:

5.84 feet hope this help you!!

Answer:

Total amount to be raised by the 8 student groups = Total amount required - Donation = $682.56 - $200.00 = $482.56Amount to be raised bu each group ...

Step-by-step explanation:

Answer:

9 - 3 = 6.

Therefore, the answer equals to 6 hours .

I hope this helps :))

Step-by-step explanation:

The approximate area of each tank that will be painted is 2287.08 ft².

The lateral surface area of a cylinder is also called the curved surface area of the cylinder.

Suppose that:

Then, the lateral surface area of that cylinder is:

[tex]S_L = 2\pi r h \: \rm unit^2[/tex]

The missing image is attached below.

The tank is cylindrical in shape.

For this case, we've got:

Radius = half of diameter = 28/2 = 14 ft

Thus, the curved surface area of each of such tanks is:

[tex]S_L = 2\pi r h = 2\pi (14)(26) = 728\pi \approx 2287.08 \: \rm ft^2[/tex]

Thus, the approximate area of each tank that will be painted is 2287.08 ft².

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Answer: 2287.08 ft²

Step-by-step explanation: Correct for plato/Edmentum

The number of girls = total number of students - total number of boys

60 - 36  = 24

The number of boys that study French = 2/3 x 36 = 24

The numbber of boys that study German = 36 - 24 = 12

The number of girls that study French = 40 - 24 = 16

The number of girls that study German = 24 - 16 = 8

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Answer:

See below for the proof of the identity

Step-by-step explanation:

I read your statement as [tex]\displaystyle \frac{\tan\theta-\cot\theta}{\tan\theta+\cot\theta}+2\cos^2\theta=1[/tex]:

[tex]\displaystyle \frac{\tan\theta-\cot\theta}{\tan\theta+\cot\theta}+2\cos^2\theta\\\\\frac{\frac{\sin\theta}{\cos\theta}-\frac{\cos\theta}{\sin\theta}}{\frac{\sin\theta}{\cos\theta}+\frac{\cos\theta}{\sin\theta}} +2\cos^2\theta\\\\\frac{\frac{\sin^2\theta-\cos^2\theta}{\sin\theta\cos\theta}}{\frac{\sin^2\theta+\cos^2\theta}{\sin\theta\cos\theta}} +2\cos^2\theta\\\\\frac{\frac{\sin^2\theta-\cos^2\theta}{\sin\theta\cos\theta}}{\frac{1}{\sin\theta\cos\theta}} +2\cos^2\theta[/tex]

[tex]\displaystyle \sin^2\theta-\cos^2\theta+2\cos^2\theta\\\\\sin^2\theta+\cos^2\theta\\\\1[/tex]

Thus, the identity is proven.

Let's see

The integers be

So their sum

Divided by 6

Tune down into ratio

Put final equation on line

Spare equations

The correct equation for the statement: 3n+6:6=8

Algebra is a branch of mathematics dealing with symbols and the rules for manipulating those symbols. In elementary algebra, those symbols (today written as Latin and Greek letters) represent quantities without fixed values, known as variables.

Let the three consecutive integers be

So their sum

n+n+2+n+4

and,

=n+n+2+n+4/6

=(3n+6)/6

= (n+2)/6

Hence, correct equation for the statement: 3n+6:6=8

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Answer:

135

Step-by-step explanation:

45+30+30+30

Answer:

empezando multiplicar todos los números seria un total de 1785  que lo pondremos con m3  que un metro cubico seria 1000L entonces con los 1785 los ponemos por 1 000  

Step-by-step explanation:

respuesta 1 785 000

Answer:

200.96

Step-by-step explanation:

2(3.14)2^2 + 2(3.14)2*14

8*3.14 = 25.12

56*3.14 = 175.84

175.84 + 25.12 = 200.96

Hey there!

What is the mean of the data set?

22 ✅

You first have to know what is a mean (or average) :

MEAN : Sum of values divided by the number of values.

[tex] \text{mean} = \frac{sum \:of\: the \:values}{number \: of \: values} \\ \\ \Longrightarrow \frac{18 + 22 + 14 + 30 + 26}{ 5 } \\ \\ \Longrightarrow \frac{110}{5} \\ \\ \Longrightarrow \red{\boxed{\blue{22}}} [/tex]

Therefore, the mean of the data set is 22.

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The mean can be calculated by determining the sum of the chosen pumpkins and dividing it by the total pumpkins chosen for the photograph.

Therefore, the fraction that represents the mean is:

[tex]\dfrac{18 + 22 + 14 + 30 + 26}{5}[/tex]

When we simplify the fraction, we get:

[tex]\implies \dfrac{18 + 22 + 14 + 30 + 26}{5}[/tex]

[tex]\implies \dfrac{40 + 14 + 30 + 26}{5}[/tex]

[tex]\implies\dfrac{70 + 14 + 26}{5}[/tex]

[tex]\implies\dfrac{70 + 40}{5}[/tex]

[tex]\implies\dfrac{110}{5} = 22[/tex]

Therefore, the mean of the data set is 22.

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Answer:

$p - $5

or just p - 5

Step-by-step explanation:

I hope this helps

Answer:

$870.00 is the motorcycle price after a 40% discount

Step-by-step explanation:

discount = original price x discount % / 100

discount = 1450 x 40 / 100

discount = 1450 x 0.4

discount = $580.00

Final Price = Original Price - Discount

Final Price = 1450 - 580

Final Price = $870

Step-by-step explanation:

1. You have to find the gradient / slope from y = 5x + 20

y = 5x + 20

y = mx + c

With using a general form, we known that the gradient of the line is 5.

2. Use the formula "[tex]y - y_1 = m.(x - x_1)[/tex]" to find the line.

[tex]y - y_1 = m.(x - x_1)[/tex]

[tex]y - 10 = 5.(x - 0)[/tex]

[tex]y = 5x - 0 + 10[/tex]

[tex]y = 5x + 10[/tex]

Answer:

y = 5x + 10.

Step-by-step explanation:

Y = 5x + 20

The gradient m = 5

So the line parallel to it has a gradient of 5 also.

Using the point slope form of straight line:

y - y1 = m(x - x1)

Here,  m = 5, x1 = 0 and y1 = 10:

y - 10 = 5(x - 0)

y - 10 = 5x

y = 5x + 10.

The area of the training field will be 6933.06 square meters.

It deals with the size of geometry, region, and density of the different forms both 2D and 3D.

A training field is formed by joining a rectangle and two semicircles, as shown below. The rectangle is 86 m long and 54 m wide.

Then the area of the training field will be

Area = area of a rectangle + area of a circle

Then we have

Area = 86 x 54 + 3.14 x 27 x 27

Area = 4644 + 2289.06

Area = 6933.06 m²

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Answer:

I normally just plug these into desmos.

Step-by-step explanation:

Explanation:

The rule to use here is log(x)-log(y) = log(x/y)

So,

log(6)-log(3) = log(6/3) = log(2)

Answer:

log(2)

Step-by-step explanation:

As we have,

log(a)−log(b)=log(a/b)

Replace 'a' as 6 and 'b' as 3.

Then we get,

[tex]\hookrightarrow log(6)-log(3)\\\\\hookrightarrow log(\frac{6}{3} )\\\\\hookrightarrow log(2)[/tex]

Answer:

Hi the answer is A. 40

Answer:

I am not sure if this is correct but:

Step-by-step explanation:

The height of Corbin's model given the actual height of the monument and the scale of the model is 6.04 inches.

A scale model is smaller representation of a bigger object / drawing. The scale model is reduced by constant dimensions.

The height of Corbin's model = 604 / 100 = 6.04 inches

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Answer:

B

Explanation:

The north is opposite to the south

So the vector [tex]j[/tex] represents 1 mile per hour south.

Maria is jogging south at 12 miles per hour.

Therefore, the vectors [tex]12j[/tex] represents Maria's velocity. The correct answer is B.

The vector used to represent the position of Maria is -12j.

A measurement with a magnitude and direction. It is often represented by an arrow whose length is proportional to the magnitude of the quantity and whose direction is the same as that of the quantity. A vector does not have position, while having magnitude and direction.

Given:

vector i represents 1 mile per hour east

and, vector j represents 1 mile per hour north

Now, the position of north is opposite to south

Now, Maria is jogging south at 12 miles per hour.

So, the vector used to represent the position of Maria is -12j.

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Answer:

90.78%

Step-by-step explanation:

So the 100% value of the car=$28500

We don't know the percentage ?% =$25875

So 25875/28500×100=90.78%

Collection of domestic animals is a set. However, a collection of big domestic animal is not a set as it is a subset.

Domestic animals are known to bee  dogs, cats, etc. that can live along with humans.

Note that Collection of domestic animals is a set but the collection of big domestic animal is a subset of domestic animals this is because the big domestic animal are part of the domestic animals and as such it will be a subset.

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Answer:

60 degrees

Step-by-step explanation:

Vertical angles are angles opposite of each other created by intersecting lines.

Vertical angles are always congruent ( equal ) to each other.

So if an angle has a measure of 60 degrees then its vertical angle would also have a measure of 60 degrees

Answer:

60°

Step-by-step explanation:

Vertical angles are angles of the same measure.

One of the vertical angles is 60°. Therefore, the other angle must be 60°.

Hope this helps!!!

Please give me brainliest!!!

I only need one more brainliest for Virturoso so please give me brainliest

Answer: both of the bars and number line equal 2 2/3

Step-by-step explanation:

The answer is choice A, B, and C.

Answer:

122

Step-by-step explanation:

180 degrees is in a triangle

180- 45-15= 122

thats how you get your answer

. you subtract the two points from 180 to get the missing point

- AKIA

Answer:

x is about 1.6587 (do the curved equal sign)

Step-by-step explanation:

Checked with symbolab,

So you expand x(x+3)^2

Then -36 from both sides

Then simplify

Then find one solution to x

Then Use long division to get your answer.