which of the following is not a characteristic of both surveys and observational studies?
a. the researcher direct control over at least one variable
b. data are collected about population
c. the researcher does not control or change the population
d. results are not used to prove cause and effect

Answer: mi = 52 x h or y = 52 times x

distance (mi) = y

time (h) = x

It goes 52 miles per hour!  Hope this helps.

Answer:

Step-by-step explanation:

To pack six chocolate bars to take up as little room as possible, we can arrange them in two layers of three bars each. Here is a sketch of one possible way to pack six chocolate bars:

```

_______ _______ _______

| || || |

| C || C || C |

|_______||_______||_______|

| || || |

| C || C || C |

|_______||_______||_______|

```

In this arrangement, the bars are packed tightly together and take up the least amount of space.

To find the size of the box needed for 48 chocolate bars, we first need to find the volume of one chocolate bar. The dimensions of each chocolate bar are given as 2.1 cm x 3 cm x 12 cm, so the volume is:

V = l x w x h = 2.1 cm x 3 cm x 12 cm = 75.6 cm^3

To pack 48 chocolate bars, we need to find the total volume they occupy:

Total volume = 48 x V = 48 x 75.6 cm^3 = 3,628.8 cm^3

Since the chocolate bars are packed into cuboid-shaped boxes, we need to find the dimensions of the box that can accommodate the total volume of the bars. Let's call the length, width, and height of the box L, W, and H, respectively. Then we have:

L x W x H = 3,628.8 cm^3

We want to find the smallest possible box, so we need to minimize each of the dimensions. We can start by setting two of the dimensions equal to each other and solving for the third. Let's set L = W and solve for H:

L x L x H = 3,628.8 cm^3

H = 3,628.8 cm^3 / L^2

Substituting L = W, we get:

H = 3,628.8 cm^3 / W^2

Now we can express the volume of the box in terms of just one variable:

L x L x H = L^2 x H = L^2 x (3,628.8 cm^3 / L^2) = 3,628.8 cm^3

Simplifying, we get:

L^3 = 3,628.8 cm^3

Taking the cube root of both sides, we get:

L = 16 cm (rounded to the nearest whole number)

So the length and width of the box should be 16 cm, and the height can be calculated as:

H = 3,628.8 cm^3 / (16 cm x 16 cm) = 14.2 cm (rounded to one decimal place)

Therefore, a box with dimensions 16 cm x 16 cm x 14.2 cm can accommodate 48 chocolate bars packed as described earlier.

Answer:

Brief description of the functions of brain cells, blood cells, and muscle cells.

Brain cell (Neuron):

Blood cell (Erythrocyte, Leukocyte, and Platelet):

Muscle cell (Myocyte):

We are able to count the frequency of ages falling within each interval using class of 10 years. The histogram is drawn for the frequency table as well below.

To create class intervals, we will use range of 10 years each. Starting from the minimum age of 6, we can use the following intervals [tex]6-15, 16-25, 26-35, 36-45, 46-55, 56-65, 66-75.[/tex]

Now, we can count the frequency of ages falling within each interval:

Class - Frequency

6-15:      3

16-25:    3

26-35:   4

36-45:   2

46-55:   2

56-65:   1

66-75:   1

To create histogram, we will represent the class intervals on the x-axis and the frequency on the y-axis. Each interval's frequency is represented by the height of a bar.

The representation of the histogram using the frequency table i as follows:

  4 |

  3 |             x

  2 | x        x     x

  1 |  x

    -----------------------------

       6-15   16-25 26-35

The x represent the bars of the histogram.

Read more about frequency table

brainly.com/question/27820465

#SPJ1

hope u find this helpful

️

The height of the rectangular chest should be 2 feet.

To determine the height of the rectangular chest, we can use the formula for the volume of a rectangular prism:

Volume = Length * Width * Height

We are given that the length is 6 feet, the width is 2 feet, and the volume is 24 cubic feet. Let's substitute these values into the formula and solve for the height:

24 = 6 * 2 * Height

Dividing both sides of the equation by (6 * 2):

24 / (6 * 2) = Height

24 / 12 = Height

2 = Height

For more question on rectangular click on

https://brainly.com/question/2607596

#SPJ11

Answer: Range is 8 and median is 7

Step-by-step explanation:

To find the range is to take the number with the highest value and subtract that from the number with lowest value. So you would take 9 and 1 (9-1) and would get 8

To find the median, you need to rearrange the numbers from lowest to highest, and find the middle of it. Since the order of numbers is perfectly arranged, the median is 7

Answer:

4(2x - 1) + 3(2x + 5)

Step-by-step explanation:

4(2x - 1) + 3(2x+5)

Multiply 4 with 2x - 1 and multiply 3 with 2x + 5,

8x - 8 + 6x + 15 = 0

Arrange x and constant,

8x + 6x = 8 - 15

14x = - 7

14x = - 7

x = -7/14

x = -1/2

x = -0.5

Hope this helps! Recheck the answers.

The probability of rolling a number greater than 2 on a standard number cube is 2/3.

Since we are interested in the probability of rolling a number greater than 2, we need to count the favorable outcomes and divide them by the total number of possible outcomes.

The numbers greater than 2 on the cube are 3, 4, 5, and 6, which means there are four favorable outcomes.

Since the cube has six possible outcomes in total, the probability of rolling a number greater than 2 is 4/6, which simplifies to 2/3.

Therefore, the probability of rolling a number greater than 2 on a standard number cube is 2/3.

Learn more about probability here:

https://brainly.com/question/30034780

#SPJ1

The complement of the set {2,4,11,14,17} is {3, 6, 9, 19}.

The complement of set A is defined as a set that contains the elements present in the universal set but not in set B.

In other words, the complement of a set is the difference between the universal set and the set itself.

Therefore,

U = universal set =  {2, 3, 4, 6, 9, 11, 14, 17, 19}

Therefore,

complement of {2,4,11,14,17} is the values that are not in the universal set.

Therefore,

complement of  {2,4,11,14,17}  = {3, 6, 9, 19}

learn more on sets here: brainly.com/question/29166083

#SPJ1

The equation for the instantaneous velocity, v(t), of the bumblebee at any point in time is v(t) = 12 - 18t²

To find the equation for the instantaneous velocity of the bumblebee at any point in time, we need to take the derivative of the distance function, p(t), with respect to time (t).

Given that p(t) = 12t - 6t³ + 1, we can find the derivative using the power rule of differentiation.

Derivative of p(t) with respect to t:

p'(t) = d/dt (12t - 6t³ + 1)

= 12 - 18t²

Therefore, the equation for the instantaneous velocity, v(t), of the bumblebee at any point in time is:

v(t) = 12 - 18t²

That the velocity function v(t) is the derivative of the distance function p(t).

for such more question on velocity

https://brainly.com/question/16763767

#SPJ11

The ranking from the lowest to highest APR for the given companies is A, B, D, C.

The correct option is b.

To rank the companies from the lowest to highest Annual Percentage Rate (APR) based on a $600 loan amount, we need to calculate the APR for each company. The formula to calculate APR is APR = (Fees / Loan Amount) * (365 / Terms of Loan).

Let's calculate the APR for each company:

For Company A:

APR_A = ($60 / $600) x (365 / 18) = 0.1 x 20.28 = 2.028%

For Company B:

APR_B = ($80 / $600) x (365 / 12) = 0.1333 x 30.42 = 4.054%

For Company C:

APR_C = ($90 / $600) x (365 / 10) = 0.15 x 36.5 = 5.475%

For Company D:

APR_D = ($110 / $600) x (365 / 14) = 0.1833 x 26.07 = 4.79%

Now, we can rank the companies from the lowest to highest APR:

Company A - APR: 2.028%

Company B - APR: 4.054%

Company D - APR: 4.79%

Company C - APR: 5.475%

To learn more about the percentage;

https://brainly.com/question/24159063

#SPJ1

Answer:

(a) - [tex]\sin(y)=-3\cos(x)+4[/tex]

(b) - [tex]y=e^{2x-1}[/tex]

Step-by-step explanation:

Given the two part question...

(a) - Solve the following first-order differential equation with the given initial condition.

[tex]y'=\frac{3\sin(x)}{\cos(y)}; \ y(0)=\frac{\pi}{2}[/tex]

(b) - Given that y=f(x) passes through the point (1,e) and has the property that the slope of the tangent line to the graph at any point "P" is equal to twice the y-coordinate of "P." Find f(x).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Part (a) -

The given DE is a separable differential equation and can be solved in the following manner.

[tex]\boxed{\left\begin{array}{ccc}\text{\underline{Seperable Differential Equation}}\\\frac{dy}{dx}=f(x)g(y) \\ \rightarrow \int\frac{dy}{g(y)}=\int f(x)dx \end{array}\right}[/tex]

[tex]y'=\frac{3\sin(x)}{\cos(y)} \rightarrow \frac{dy}{dx} =\frac{3\sin(x)}{\cos(y)}\\\\\Longrightarrow \cos(y)dy=3\sin(x)dx\\\\\Longrightarrow \int\cos(y)dy=3\int\sin(x)dx\\\\\Longrightarrow \boxed{\sin(y)=-3\cos(x)+C}\\\\\text{Now for the given initial condition to find the arbitrary constant, "C."}\\\text{Initial condition} \longrightarrow y(0)=\frac{\pi}{2} \\\\\Longrightarrow \sin(\frac{\pi}{2})=-3\cos(0)+C\\\\\Longrightarrow 1=-3(1)+C\\\\\Longrightarrow \boxed{C=4}\\\\[/tex]

[tex]\therefore \boxed{\boxed{\sin(y)=-3\cos(x)+4}}[/tex]

Thus, the DE is solved.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Part (b) -

[tex]\text{The slope of the tangent line =} \ \frac{dy}{dx} \\\\\text{According to the question, the slope of the tangent line =} \ 2y\\\\\text{So we can say,}\\\\\longrightarrow \boxed{\frac{dy}{dx}=2y} \ \text{Solve the DE}[/tex]

[tex]\frac{dy}{dx}=2y\\\\\Longrightarrow \frac{dy}{2y}=dx \\\\\Longrightarrow \frac{1}{2} \int\frac{dy}{y}=\int dx\\\\\Longrightarrow \frac{1}{2} \ln(y)=x+C\\\\\Longrightarrow \boxed{\ln(y)=2x+ \bar C}[/tex]

Use the given initial condition to find "C." y(e)=1

[tex]\Longrightarrow \ln(e)=2(1)+ \bar C\\\\\Longrightarrow 1=2+ \bar C\\\\\Longrightarrow \boxed{C=-1}[/tex]

[tex]\Longrightarrow \ln(y)=2x+ \bar C\\\\\Longrightarrow \ln(y)=2x-1\\\\ \therefore \boxed{\boxed{ y=e^{2x-1}}}[/tex]

Thus, f(x) is found.

To calculate the amount of money in the account after 1 year, we can use the following formula:

A = P(1 + r/n)^nt

Where:

Plugging in the given values, we get:

A = 500(1 + 0.05/4)^4*1

A = 500(1.0125)^4

A = $515.63

Therefore, after 1 year, the account will have $515.63.

Answer:

step-by-step:

Solution: y = 4x - 3

The correct statement regarding the transformations is given as follows:

C) Reflection, then dilation results in an image that is not congruent to the original.

Examples of transformations are given as follows:

For the first transformation in this problem, the orientation of the figure is changed, hence it underwent a reflection.

For the second transformation, the figure was reduced, hence it underwent a dilation, meaning that the congruence was lost, as the side lengths are different.

More can be learned about transformations in a figure at https://brainly.com/question/28687396

#SPJ1

The question is referring to two functions: h(x) and g(x).

The specific functions h(x) and g(x) are not given in the information provided, but we are given the equation of g(x) as -x^2 - 2x + 6. Without knowing the equation of h(x) or having a visual comparison of the functions, we cannot directly compare them.

The question is asking for the correct statement regarding the comparison between h(x) and g(x).

The answer choices are discussing the maximum value and the value at x=3 for both h(x) and g(x).

To identify the maximum of h(x) and g(x), we need either the equations of the functions or a visual representation of their graphs. Without this information, we cannot determine the maximum values.

Similarly, without knowing the equations of the functions or having a graph, we cannot identify the values of h(x) and g(x) at x=3.

Based on the lack of information provided to make direct comparisons between h(x) and g(x), it is not possible to determine the correct answer choice.

Arithmetic sequence and Geometric sequence a₁ is an integer, the numerator must be divisible by -21.

Let's denote the common difference of the arithmetic sequence as 'd' and the common ratio of the geometric sequence as 'r'.

Since a4, a7, and a12 form a geometric sequence, we can express the terms as follows:

a4 = a₁ + 3d

a7 = a₁ + 6d

a12 = a₁ + 11d

We know that a7 = 30, so we can substitute it into the equation:

a₁ + 6d = 30

Now, let's examine the ratio between consecutive terms in the geometric sequence:

(a7 / a4) = (a12 / a7)

Substituting the expressions for the terms, we get:

[(a₁ + 6d) / (a₁ + 3d)] = [(a₁ + 11d) / (a₁ + 6d)]

Cross-multiplying, we have:

(a₁ + 6d)(a₁ + 6d) = (a₁ + 3d)(a₁ + 11d)

Expanding the equation, we get:

a₁² + 12ad + 36d² = a₁² + 14ad + 33d²

Simplifying and rearranging terms, we obtain:

2ad = -3d²

Since the sequence is non-constant, the common difference 'd' cannot be zero. Therefore, we can divide both sides of the equation by 'd':

2a = -3d

Substituting the value of 'd' from the equation a₁ + 6d = 30, we have:

2a = -3(a₁ + 6d)

Expanding and simplifying:

2a = -3a₁ - 18d

Now, we can substitute the value of 'd' from the equation a₁ + 6d = 30:

2a = -3a₁ - 18(a₁ + 6d)

Expanding and simplifying further:

2a = -3a₁ - 18a₁ - 108d

Since a₁ + 6d = 30, we can substitute it again:

2a = -3a₁ - 18a₁ - 108(a₁ + 6d)

Expanding and simplifying:

2a = -3a₁ - 18a₁ - 108a₁ - 648d

Combining like terms:

2a = -129a₁ - 648d

Now, we can substitute the known value of a₇ = 30 into the equation a₁ + 6d = 30:

a₁ + 6d = 30

Rearranging the equation:

a₁ = 30 - 6d

Substituting this into the previous equation:

2a = -129(30 - 6d) - 648d

Expanding and simplifying:

2a = -3870 + 774d - 648d

Combining like terms:

2a = -3870 + 126d

Now, we can substitute the value of 2a = -3a₁ - 18a₁ - 108d into the equation:

-3a₁ - 18a₁ - 108d = -3870 + 126d

Expanding and simplifying:

-21a₁ - 108d = -3870 + 126d

Rearranging the equation:

-21a₁ = 234d - 3870

Dividing both sides by -21:

a₁ = (234d - 3870) / -21

Since arithmetic sequence and geometric sequence a₁ is an integer, the numerator must be divisible by -21

For such more questions on Arith. and Geom. Sequence

https://brainly.com/question/31343618

#SPJ8

The ratio of EG = 36.

Let's assign variables to the lengths of the line segments:

EF = x

FG = 5x

GH = 3x

We know that EH = EF + FG + GH.

Substituting the given values, we have:

54 = x + 5x + 3x

Combining like terms, we get:

54 = 9x

To isolate x, we divide both sides of the equation by 9:

54/9 = x

Simplifying, we find:

6 = x

EF = 6, FG = 5(6) = 30, and GH = 3(6) = 18.

Since EG is the sum of EF and FG, we can calculate it as follows:

EG = EF + FG = 6 + 30

= 36

EG = 36.

For similar questions on ratio

https://brainly.com/question/12024093

#SPJ11

The statement that explains why some elements decay and others do not is: "Elements that decay have a proton to neutron ratio that is too high or too low."

Decay of elements refers to the process of spontaneous transformation where an unstable atomic nucleus undergoes a change, often resulting in the emission of radiation or the formation of a new element.

The stability of an atomic nucleus depends on the balance between the strong nuclear force, which holds protons and neutrons together, and the electromagnetic force, which repels protons due to their positive charge.

Elements with a proton to neutron ratio that is too high or too low are generally more likely to decay.

This is because the imbalance in the ratio affects the stability of the nucleus.

A high proton to neutron ratio means that there are more protons than neutrons, leading to increased electrostatic repulsion between protons. On the other hand, a low proton to neutron ratio means there are more neutrons than protons, which can result in an unstable nucleus.

To achieve a more stable configuration, elements with an imbalanced proton to neutron ratio can undergo radioactive decay processes such as alpha decay, beta decay, or gamma decay.

These processes help the nucleus reach a more favorable balance of protons and neutrons, ultimately increasing its stability.

It's important to note that not all elements with an imbalanced proton to neutron ratio decay.

Some isotopes may have a slightly unstable configuration but still exist for long periods or even indefinitely.

The specific factors contributing to the stability or decay of an element involve the exact balance of nuclear forces, the energy differences between nuclear configurations, and other considerations that are governed by the fundamental laws of physics.

For similar question on stable configuration.  

https://brainly.com/question/29782011

#SPJ11

Answer:

Part A:

122.5 cubic inches

Part B:

No

Step-by-step explanation:

Part A:

The volume of a rectangular prism is the product of its length, width, and height. Volume = 5 x 3.5 x 7 = 122.5 cubic inches Since the volume of the box is less than 22 cubic inches.

Part B:

Answer: 2.✅ 4.✅

Step-by-step explanation: Pythagorean Theorem.
1. 3^2+5^2=√34❌

2. 5^2+4^2=√41✅

3. 6^2+8^2=10❌; it is only 10 NOT √10

4. 3^2+3^2=3√2; 45-45-90 triangle (always right triangle)

The altitude of each trapezoid is 4 feet.

We are given that;

The cost for paint to cover the exterior=$80

A can of paint cost= $20

Now,

We can find the total area of all four sides:

80 / 20 = 4 cans of paint

4 cans * 24 sq ft/can = 96 sq ft

Each side has an area of 96 / 4 = 24 sq ft.

Now we can use the formula for the area of a trapezoid to find the altitude:

24 = (5 + 7) * h / 2

24 = 6h

h = 4

Therefore, by area the answer will be 4 feet.

Learn more about the area;

https://brainly.com/question/1658516

#SPJ1

The ordered pair (0, -3) satisfies the relation 2x + y = -3.

To determine which ordered pair satisfies the relation 2x + y = -3, we can substitute the values of x and y from each option into the equation and check if the equation holds true.

a) (-1, 4):

2(-1) + 4 = -2 + 4 = 2 (not equal to -3)

b) (-2, -1):

2(-2) + (-1) = -4 - 1 = -5 (not equal to -3)

c) (0, -3):

2(0) + (-3) = -3 (equal to -3)

d) (-3, -3):

2(-3) + (-3) = -6 - 3 = -9 (not equal to -3)

Therefore, the ordered pair (0, -3) satisfies the relation 2x + y = -3.

Learn more about Equation here:

https://brainly.com/question/29657983

#SPJ1

The statement is saying that the Separation Axioms are not strong enough to develop set theory with its usual operations and constructions.

The Separation Axioms are a set of axioms that allow us to define subsets of sets. However, they are not strong enough to allow us to define the union of two sets, or the notion of a real number.

The union of two sets is the set that contains all the elements that are in either set, or in both sets. For example, the union of the set {1, 2, 3} and the set {4, 5, 6} is the set {1, 2, 3, 4, 5, 6}.

A real number is a number that can be represented on a number line. Real numbers include all the rational numbers (numbers that can be written as a fraction of two integers), as well as all the irrational numbers (numbers that cannot be written as a fraction of two integers).

The Separation Axioms are not strong enough to define the union of two sets or the notion of a real number because they do not allow us to define arbitrary subsets of sets. For example, the Separation Axioms do not allow us to define the subset of all real numbers that are greater than 0.

Find out more on Separation Axioms here: https://brainly.com/question/32301030

#SPJ1

The container with the greater volume is cylinder A and it is 176.6 cm³ greater than cylinder B

A cylinder is made up of a rolled surface with a circular top and a circular base. A cylinder can also be called a circular based prism.

The volume of a cylinder is expressed as;

V = πr²h

where r is the radius and h is the height.

Volume of cylinder A

V = 3.14 × 6² × 10

V = 360 × 3.14

V = 1130.4 cm³

Volume of cylinder B

V = 31.4 × 4.5²× 15

V = 953.78 cm³

Therefore cylinder A has a greater volume and it's 176.6cm³ more than cylinder A

learn more about volume of cylinder from

https://brainly.com/question/9554871

#SPJ1

The equation of line B passing through (0,1) and (-1,0) is y = x + 1.

To find the equation of a line, we can use the slope-intercept form, which is given by y = mx + c, where m represents the slope of the line and c represents the y-intercept.

First, let's calculate the slope (m) using the given points (0,1) and (-1,0):

m = (y2 - y1) / (x2 - x1)

= (0 - 1) / (-1 - 0)

= -1 / (-1)

= 1

Now that we have the slope (m = 1), we need to find the y-intercept (c). We can substitute the coordinates of one of the given points into the equation y = mx + c and solve for c.

Using the point (0,1):

1 = 1(0) + c

c = 1

Therefore, the equation of line B passing through (0,1) and (-1,0) is:

y = 1x + 1

or

y = x + 1

To work more problems on the equation of line click:

https://brainly.com/question/21511618

#SPJ1