Help me out please
answers:
-1/3
3
1/3
-3
please do x to

Variable location is an example of a lurking variable in a study of medicine to remove the redness in eyes when tested in a group of 100 students. The statement is true.

Hidden variable is a variable that has a connection (e.g., may be correlated) with the answer and the explanatory variable but is neither the explanatory variable nor the response variable. Although it is not taken into account in the study, it might affect how the variables are related.

A hiding variable may misidentify a significant correlation between variables or may conceal the real correlation. A research scientist might, for instance, look at how nutrition and exercise affect someone's blood pressure. Smoking status and stress levels are additional factors that also influence blood pressure.

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The number of goats sleep in Room 1 is 6, Room 2 is 7 and in Room 3 is 8.

A linear equation can also be generated by equating to zero a linear polynomial over some field and extracting the coefficients.

The values that, when substituted for the unknowns, make the equality true are the solutions to such an equation.

With two variables, each solution can be understood as the Cartesian coordinates of a Euclidean plane point. This is where the name "linear" comes from when describing these types of equations.

Given total goats=21

Let the goats in room 1 be x.

Then, in the second room be x+1

And in the third room be (x+1)+1

x+(x+1)+(x+2)=21

3x+3=21

3x=18

x=6

Therefore, room 1=6

Room 2=7

Room 3=8

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Answer: The number of goats sleeping in Room 1 is 6, Room 2 is 7 and Room 3 is 8.

What is a linear equation?

A linear equation can also be generated by equating to zero a linear polynomial over some field and extracting the coefficients.

When substituted for the unknowns, the values that make the equality true are the solutions to such an equation.

With two variables, each solution can be understood as the Cartesian coordinates of a Euclidean plane point. This is where the name "linear" comes from when describing these types of equations.

Given total goats=21

Let the goats in room 1 be x.

Then, in the second room be x+1

And in the third room be (x+1)+1

x+(x+1)+(x+2)=21

3x+3=21

3x=18

x=6

Therefore, room 1=6

Room 2=7

Room 3=8

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Step-by-step explanation:

Answer:

D

Step-by-step explanation:

24cd-36c²d = (4×6)c×d-(4×9)c×c×d

Then we take the common numbers and variables

4cd(6-9c) and to check our answer we can distribute 4cd to get:

4cd×6-(4cd×9c)

24cd-36c²d

a. The table represents a function.

b. The domain is given as follows: {1, 2, .., 12 AM, 1, 2, ... , 12 PM).

c. The range is given as follows: {1, 2, 3, ..., 24}.

To obtain whether a relation represents a function, we need to observe if each input is mapped to only one output.

This table gives the conversion of hours in the AM-PM format to hours in the military format. Each hour in the AM-PM format has only one equivalent hour in the military format, that is, each input is mapped to a single output, hence the table in fact represents a function.

The domain of a function is the set that contains all the input values of the function, hence for this problem the domain is the set of hours in the AM-PM format.

The range of a function is the set that contains all the output values of the function, hence for this problem the range is the set of hours in the military format.

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Answer:

y=-1x+3

Step-by-step explanation:

Find the equation of a line given the slope m = -1 and the point P = (-12 , 15)

Now, the y-intercept is b=y1−m⋅x1

b = 15 - (-1) ⋅ (-12) = 3

Finally, the equation of the line can be written in the form y=mx+b.

y = -1x + 3

Slope-intercept form is:

y = -1x + 3

Point-slope form is:

y - (15) = -1 ⋅ ( x - (-12))

If you want to check if right then:

Input the point given it should give you the y output if the equation of the line is correct.

-1x-(12)=12 and then add 3 and you get 15. It is therefore correct (-12,15).

I hope this helps!^^

Answer:

Step-by-step explanation:

A health researcher conducted a survey and recorded the percentage of body fat of 20 randomly selected men from two different towns.

Answer: 7 hrs and 15 minutes

Step-by-step explanation: because 15 - 8 = 7 45 - 30 = 15

The value of the decimal equivalent for 120 will be;

⇒ 0.05

What is Decimal number?

A decimal number is a number that consists of a whole and a fractional part.

Given that;

Jacob knows that 120 means “1 divided by 20.”

Now,

Since, Jacob knows that 120 means “1 divided by 20.”

Hence, The value of 120 by using this will be;

⇒ 1/20 = 0.05

Thus, The value of the decimal equivalent for 120 will be;

⇒ 0.05

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The domain of the rational function  [tex]\frac{x^3 + 5x^2 + 3x - 9}{x^2 -x - 2}[/tex] is:

D: {x ∈ R| x ≠ -1, 2}

The domain will be the set of all real numbers, minus these ones that make the denominator equal to zero.

The denominator will be zero when:

x² - x - 2  =0

Using the quadratic formula we will get:

[tex]x = \frac{1 \pm \sqrt{(-1)^2 - 4*1*-2} }{2*1} \\\\x = \frac{1 \pm 3}{2}[/tex]

The two solutions are:

x = (1 + 3)/2 = 2

x = (1 - 3)/2 = -1

If the numerator is not zero on these values, then we need to remove them from the domain.

When x = 2 the numerator is:

2³ + 5*2² + 3*2 - 9 = 25

When x = -1

(-1)³  + 5*(-1)²  + 3*-1 - 9 = -8

Neither of these is zero, so we need to remove x = -1 and x = 2 from the domain, then the domain is:

D: {x ∈ R| x ≠ -1, 2}

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As per the question the required hypothesis are

Null Hypothesis, H0: p=0.72

Alternate Hypothesis, H1 : p ≠ 0.72

The null hypothesis reflects that there will be no observed effect in our experiment. In a mathematical formulation of the null hypothesis, there will typically be an equal sign. This hypothesis is denoted by H0.

The null and alternative are always claims about the population. That’s because the goal of hypothesis testing is to make inferences about a population based on a sample.

Often, we infer whether there’s an effect in the population by looking at differences between groups or relationships between variables in the sample. It’s critical for your research to write strong hypotheses.

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The value of the expression, 13(a • b + a²) + 4, when a = 5 and b = -3 is: B. 134.

To find the value of an expression, we have to plug in the respective values for each of the variables given in the expression, then simplify.

Given the expression, 13(a • b + a²) + 4, where:

a = 5

b = -3

To find the value, substitute a = 5 and b = -3 into the expression:

13(5 • -3 + 5²) + 4

13(-15 + 25) + 4

13(10) + 4

= 130 + 4

= 134

The value is: B. 134.

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The measure of angle 'a' is 64.8°.

What is supplementary angles?

Two angles are considered to be supplementary if their sums total 180 degrees.

For instance, angle 130° and angle 50° are supplementary angles since the sum of these two angles is 180°.

The given angle is a = 115.2°.

We have to find the angle 'b' supplementary to the angle 115.2°.

Since, sum of supplementary angles is 180 degrees.

⇒ a + b = 180°

115.2 + b = 180°

Subtract 115.2° from both sides,

b = 180° = 115.2°

b = 64.8°

Hence, the measure of angle 'b' which is supplementary to angle 'a' is 64.8°.

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By using unitary method, it can be calculated that

For $28, 84 copies can be sold

What is unitary method?

Unitary method is the process in which the value of single unit can be calculated from the value of multiple unit and the value of multiple unit can be calculated from the value of single unit. Sometimes Value of single unit can be less than the value of multiple unit. For example - The relation between the cost of a commodity and the quantity of the commodity

Sometimes Value of single unit can be more than the value of multiple unit. For example - The relation between the number of men and the number of days taken by those men to do a certain job.

Here, unitary method is used

For $6, 18 copies can be sold

For $1, [tex]\frac{18}{6}[/tex] copies can be sold

For $1, 3 copies can be sold

For $28, 3 [tex]\times[/tex] 28 copies can be sold

For $28, 84 copies can be sold

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Answer:

Length=153 yards

Width=54 yards

Hope this helps! :)

Step-by-step explanation: (153*=306, 54*2=108, 306+108=414)

P=2l+2w                                              

P=414

L=3w-9

W=w

414=2(3w-9)+2w

414=6w-18+2w

414=8w-18

+18      +18

432=8w

/8

54=w

L=3(54)-9

L=162-9

L=153

As t increases the curve is changing according to the plot points given by the parametric equations.

Define parametric equations?

The coordinates of the points that make up a geometric object, such as a curve or surface, are frequently expressed using parametric equations; in this case, the equations are collectively referred to as a parametric representation or parameterization (alternatively spelled as parametrisation) of the object. It describes a collection of numbers that represent functions with one or more independent variables. The parameters used here are the independent variables. For the representation of the coordinates that make up geometric objects like curves and surfaces, parametric equations are used. Additionally, a curve that is not a function can be drawn using parametric equations.

The equations are

x=1-t²

y=2t-t²,-1≤t≤2

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18 months of All-Star Library membership cost $76 in total.

For the given equation.

The sign-up fee for the library-all-star-members club = $40.

Let 'x' be the total number of months.

Let 'y' be the total cost.

Monthly fee = $2.

Then, the linear equation models is-

y = 2x + 40

Given that a particular club member has been a part of it for 19 months, we replace x with the number 19 as follows:

y = 2x + 40

y = 2 * 18 + 40

y = = 36 + 40

y = 76.

Thus, 18 months of All-Star Library membership cost $76 in total.

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The complete question is-

3. In order to become a member of the library-all-star-members club, there is a $40 sign-up fee and a $2 monthly fee. Write an equation in slope-intercept form that models this situation. Use equation you wrote in problem 3 to find the total cost of being an all-star library member for 18 months.

Answer:

top

Step-by-step explanation:

In the bottom, y=5x for all of the columns. In the top, y=2x for all except third column, so it is not proportional.

the rate at which water is being pumped into the tank in cubic centimeters per minute. is 1508527.582 cm³/min

The net rate of flow dV/dt = flow rate in - flow rate out

Let flow rate in = k. Since flow rate out = 8900 cm³/min,

dV/dt = k - 8900

Now, the volume of a cone V = πr²h/3 where r = radius of cone and h = height of cone

dV/dt = d(πr²h/3)/dt = (πr²dh/dt)/3 + 2πrhdr/dt (since dr/dt is not given we assume it is zero)

So, dV/dt = (πr²dh/dt)/3

Let h = height of tank = 11 m, r = radius of tank = diameter/2 = 3/2 = 1.5 m, h' = height when water level is rising at a rate of 21 cm/min = 3.5 m and r' = radius when water level is rising at a rate of 21 cm/min

Now, by similar triangles, h/r = h'/r'

r' = h'r/h = 3.5 m × 1.5 m/12 m = 5.25 m²/12 m = 2.625 m = 262.5 cm

Since the rate at which the water level is rising is dh/dt = 21 cm/min, and the radius at that point is r' = 262.5 cm.

The net rate of increase of water is dV/dt = (πr'²dh/dt)/3

dV/dt = (π(262.5 cm)² × 21 cm/min)/3

dV/dt = (π(68906.25 cm²) × 21 cm/min)/3

dV/dt = 1447031.25π/3 cm³

dV/dt = 4545982.745/3 cm³

dV/dt = 1515327.582 cm³/min

Since dV/dt = k - 6800 cm³/min

k = dV/dt - 6800 cm³/min

k = 1515327.582 cm³/min - 6800 cm³/min

k = 1508527.582 cm³/min

So, the rate at which water is pumped in is 1508527.582 cm³/min

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Answer: There are not any roots for that equation.

There is insufficient evidence to support that bolts are too long or too short.

What is Mean and Standard Deviation?

Mean: Dividing the sum of all values in a data set by the number of values.

Standard Deviation: The standard deviation is a measure that summarizes how far away from the mean each observation is.

Given:

mean: 0.94cm

standard deviation = 0.31cm

Alright, so a manufacturer must test that these bolts are long as they come off the manufacturing line and he must readjust the machines if they're too long or too short. Consequently, sample 121V and sample mean are 0.94 cm. So we want to test whether or not these are actually equal to two, so are no hypothesis is that the mean is too and our alternative hypothesis, because it says that we have to recalibrate if they're too short or too long, is that the mean is not too we could probably go with the left tail test here because the sample mean is under but we'll be safer with a two tail test um just because the standard deviation may sway things.

So what we want to do next is compute the test statistic and that's gonna be a Z score and that's just supplied by X bar minus population mean over standard deviation over squared event. And we're using Z here because we have a high sample size and since we know the population standard deviation.

Hence, There is insufficient evidence to support that bolts are too long or too short.

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Henry must have to score 86 marks in the fifth exam to make an average of 80 marks.

What is the average?

This is the arithmetic mean and is calculated by adding a group of numbers and then dividing by the count of those numbers. For example, the average of 2, 3, 3, 5, 7, and 10 is 30 divided by 6, which is 5.

Henry scored 85, 76, 84, and 69, and let's suppose he scored 'x' marks in the fifth exam.

Average = sum of all marks/total number of exams

  80 =(85 + 76 + 84 + 69 + x)/5

 80 = 314 + x/5

 80 * 5 = 314 + x

 400 = 314 + x

  x = 400 - 314

  x = 86

Hence, Henry must have to score 86 marks in the fifth exam to make an average of 80 marks.

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The calculated value |Z| = |-2.00722 | = 2.00722 > 2.054 at 0.02 level of significance. So their claim is wrong.

Given that the mean age of retirement for women, executives is 63.2

Given that the size of the sample 'n' = 78

Given that the mean of sample x⁻ = 64.2

Given that the standard deviation  'σ' = 4.4 years

Null hypothesis: H₀: μ ≠ 63.2

Alternative Hypothesis: H₁: μ = 63.2

Test statistic

Z =  -2.00722

|Z| =  2.00722 > 2.054 at 0.02 level of significance

The calculated value |Z| = 2.00722 > 2.054 at 0.02 level of significance

Therefore, we reject the hypothesis.

Statistics is the study of research and surveys on numerical data in mathematics. In order to conduct surveys, the hypothesis must be established. There are typically two different kinds of hypotheses. A null hypothesis is one that holds true, whereas an alternate hypothesis is another.

The null hypothesis is a broad assertion or default stance that there is zero happening or nothing happening in probability and statistics. For instance, there is no association between two measured events or a connection between groups.

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When the (∂z/∂x) is 0, the partial derivative (∂z/∂y) will be equal to the total derivative dz/dy.

What is Total Derivative?

The overall change in the dependent variable as a result of changes in all the independent variables is known as the total derivative of a function of multiple variables.

Given that,

A function z(x, y)and its partial derivative (∂z/∂y) is x.

We know that,

total derivative (dz) = (∂z/∂x) dx + (∂z/∂y) dy

here, (∂z/∂y) = x

So, The dz will be equal to (∂z/∂y) dy only if  (∂z/∂x) dx = 0.

hence, (∂z/∂x) should be 0.

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Answer:

There are 48 pages in the whole book.

Step-by-step explanation:

We know that 36 is 3/4 of the book. To find the total number of pages, we have to divide 36 by 3. We know that is 12. Then, we have to multiply 12 by 4 to get the answer, 48.

Answer:

y=1/2x+5.5

Step-by-step explanation:

Answer: 9/4

Step-by-step explanation:

1 1/8 divided by 1/2 can be rewrite as

=9/8 divided 1/2

=9/8 timed 2/1

=18/8

= 9/4

If you can please give me a Brainliest, I only need 3 more to become an Ace, thank you!

The expression equivalent to the given expression will be x+y+3(1+y).

It is defined as the combination of constants and variables with mathematical operators.

It is given that the expression is,( x + 3) +4y

We have to write the equivalent expression for the given expression,

Expressions that function identically despite having different appearances are called equivalent expressions. If two algebraic expressions are equivalent, then they both have the same result when the same value of the variable is entered.

=( x + 3) +4y

=x+3+4y

=x+3+y+3y

=x+y+3+3y

=x+y+3(1+y)

Thus, the expression equivalent to the given expression will be x+y+3(1+y).

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The main difference between qualitative and quantitative data sources is qualitative is the categorial type and quantitative is a type of numerical.

What are the sources of data in mathematics?

In statistics, there are two sources of data. Census data and officially conducted surveys are examples of data that is gathered for some official purposes and are referred to as statistical sources. Non-statistical sources refer to the data that are collected for other administrative purposes or for the private sector.

These are the differences between qualitative vs. quantitative data:

Quantitative data is numbers-based, countable, or measurable. Qualitative data is interpretation-based, descriptive, and related to language.

Quantitative data tells us how many, how much, or how often in calculations.

Qualitative data can help us to understand why, how, or what happened behind certain behaviors.

Quantitative data is fixed and universal. Qualitative data is subjective and unique.

Quantitative research methods are measuring and counting. Qualitative research methods are interviewing and observing.

Quantitative data is analyzed using statistical analysis. Qualitative data is analyzed by grouping the data into categories and themes.

Hence, the main difference between qualitative and quantitative data sources is qualitative is the categorial type and quantitative is a type of numerical.

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The experimental probability of an odd number other than 9 being generated is 38%.

For the stated question-

Other odd numbers outside nine are as follows: 72 - 15 = 57

Probability =  (number of odd numbers except nine)]/(total number)

Probability = 57/150

Probability = 0.38.

Thus, the experimental probability of an odd number other than 9 being generated is 38%.

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As there are 60 minutes in an hour and 24 hours in a day, there are 6 days as well as 144 days in 8640 minutes.

A number is split in division, which is a straightforward procedure. The simplest way to conceptualize it is as a set of things being distributed among a set of individuals, as in the example given above. In mathematics, division is the process of dividing a number into equal parts and calculating the maximum number of equal parts that may be formed. For instance, dividing 15 by 3 results in the division of 15 into 3 groups of 5 each.

Here,

There are 60 minutes in an hour,

=8640/60

=144 hours

There are 24 hours in a day,

=144/24

= 6 days

There is 6 days as well as 144 days in 8640 minutes as there are 60 minutes in an hour and 24 hours in a day.

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