Allison wants to know how many games teenagers at her school have on their phones. Which answer choice gives an example of a random sample Allsion could use to help answer her question?

A Ask all the 30 female teenagers and 30 male teenagers at the grocery store if they have phones.

B Ask the first 100 people at the library on Saturday morning how many games they have on their phones.

C Ask 10 people from each grade level at Allison's school how many games they have on their phones.

D Ask 5 teenagers from 20 different countries how many games they have on their phones.

Answers

Answer 1

The answer choice which gives the best-example of the "random-sample" is (c) Ask 10 people from each "grade-level" at Allison's school about how many games they have on their phones.

A "Random-Sample" is a subset of a larger population which is chosen in such a way that each member of the population has an equal chance of being selected.

The Option (c) :  gives the best example of a random sample that Allison could use to help answer her question. By asking 10 people from each grade level at her school, Allison can obtain a sample that includes a variety of ages, genders, and backgrounds.

This can help to ensure that the sample is representative of the population she is interested in studying.

Option (a) : is not a random sample because it only includes teenagers who happen to be at the grocery store at the time Allison is conducting her survey. This may not represent entire population of teenagers at her school.

Option (b) : is not a random sample either because it only includes people who happen to be at the library on Saturday morning. This may not be representative of the entire population of teenagers at her school.

Option (d) :  is not a random sample because it only includes teenagers from 20 different countries. This may not be representative of the population of teenagers at Allison's school or in her local area.

Therefore, the correct option is (c).

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Related Questions

Find the 8th term of the geometric sequence 10, 50, 250,...

Answers

The 8th term of the sequence is 781, 250.

We have geometric sequence 10, 50, 250,...

First term= 10

Common ratio = 50/10 = 5

So, the 8th term of sequence is

= 10 x [tex]r^{8-1[/tex]

= 10 x [tex]r^7[/tex]

= 10 x [tex](5)^7[/tex]

= 10 x 5 x 5 x 5 x 5 x5 x 5 x 5

= 10 x 78125

= 781, 250

Thus, the 8th term of the sequence is 781, 250.

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I NEED HELP WITH TTHIS PROBLEM IN STATISTICS

Answers

Answer:

Step-by-step explanation:

the median would be 9.

Mr. James is teaching his students about the volume of rectangular prisms. He has various rectangular prisms with a height of 6 inches. The table shows the relationship between the base of the prism and its volume. Which equation can be used to find B, the area of the base with a volume of V?

Answers

The proportional relationship used to find B, the area of the base with a volume of V, is given as follows:

B = V/6.

What is a proportional relationship?

A proportional relationship is a type of relationship between two quantities in which they maintain a constant ratio to each other.

The equation that defines the proportional relationship is given as follows:

y = kx.

In which k is the constant of proportionality, representing the increase in the output variable y when the constant variable x is increased by one.

From the table given in the image at the end of the answer, we have that the base area is a sixth of the volume, hence the equation is:

B = V/6.

Missing Information

The table is given by the image presented at the end of the answer.

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The box and whisker blot below represent some data set. Which is the maximum value of the data?

Answers

The maximum value of the data = 64

We know that in the box and whisker plot with the left end of the whisker represents the minimum value of the data and the right end of the whisker represents the maximum value.

From the attached box and whisker plot, we can observe that between two numbers on the number line there are 5 equal units.

So, the value of each unit length = 4 unit

Here, the left end of the whisker has value 8 and the right end of the whisker has value 64

This means that the meaximum value = 64

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Let f = (2x^2 − 4x + 1)(x^4 + 1). Find a splitting field and determine the Galois group of f over each of the following fields:
(a) Q √
(b) Q( 2)
(c) Q(i)
(d) Q(ζ), where ζ = e2πi/8 is a primitive eighth root of 1 in C (e) R

Answers

Answer:

To find a splitting field for f, we first factor f completely over Q:

f = (2x^2 − 4x + 1)(x^4 + 1) = 2(x - 1/2)^2(x^4 + 1)

The roots of the quadratic factor are x = 1/2 ± 1/2√2, which are real, and the roots of the quartic factor are x = ±i. Therefore, a splitting field for f is Q(i, √2).

(a) Q(√2): The roots of the quadratic factor are real, so they are already in Q(√2). The roots of the quartic factor are ±i, which are not in Q(√2). Therefore, the Galois group of f over Q(√2) is isomorphic to Z/2Z.

(b) Q(2): The roots of the quadratic factor are not in Q(2). However, both i and √2 are in Q(2), so Q(2) contains a splitting field for f. Therefore, the Galois group of f over Q(2) is trivial, since there is only one automorphism of Q(2) that fixes Q.

(c) Q(i): The roots of the quadratic factor are not in Q(i). However, √2 is in Q(i), so Q(i) contains a splitting field for f. The Galois group of f over Q(i) is isomorphic to Z/2Z × Z/2Z, since there are two complex roots and two real roots, and the complex roots are conjugates of each other.

(d) Q(ζ): The roots of the quadratic factor are not in Q(ζ). However, both i and √2 are in Q(ζ), since ζ^4 = i and ζ^8 = √2. Therefore, Q(ζ) contains a splitting field for f. The Galois group of f over Q(ζ) is isomorphic to Z/2Z × Z/2Z, since there are two complex roots and two real roots, and the complex roots are conjugates of each other.

(e) R: The roots of the quadratic factor are real, so they are already in R. The roots of the quartic factor are ±i, which are not in R. Therefore, the Galois group of f over R is isomorphic to Z/2Z.

Which best demonstrates the way consumers and producers influence each other in the free-market system? O assembly line Circular-flow model downward spiral O flow chart​

Answers

Answer:

The best choice is:

Circular-flow model

The circular-flow model demonstrates how consumer demand and production supply influence each other in a market economy. Some key points:

• Consumers demand goods and services by spending money (aggregate demand). This drives production.

• Producers supply goods and services to meet demand (aggregate supply). But supply depends on and influences demand.

• There is a continuous flow and feedback loop between consumers, producers, and the money/resources flowing between them.

The circular-flow model highlights this interconnectedness and interdependence. It shows how consumer spending drives production, which in turn enables more consumer spending, and so on. Changes in demand, supply, spending or consumption ripple through the economy.

The other choices do not accurately represent this relationship:

• Assembly line - Focuses on supply-side production process, not the demand-supply feedback loop.

• Downward spiral - Implies a negative, self-defeating cycle rather than the mutually supporting feedback in the circular-flow model.

• Flow chart - Too generic. A flow chart could represent any process, not specifically the demand-supply relationship.

So in summary, the circular-flow model is the best choice as it demonstrates the way consumer demand and producer supply interact with and influence each other in a free market system. The circular flow of money, resources, supply and demand relies on this interconnection.

Does this help explain the circular-flow model and why it is the best choice? Let me know if you have any other questions!

Step-by-step explanation:

Consider the first quadrant of the unit circle. How does the covenant ratio change as the sine ratio increases?

Answers

Answer:

For acute angles, remember what sine means: opposite over hypotenuse. If we increase the angle, then the opposite side gets larger. That means "opposite/hypotenuse" gets larger or increases.

Step by Step:

Keep this in mind >>

Consider the unit circle > The sine and cosine ratios are the only ratios that have 1 (the radius or hypotenuse) as the denominator. The numerators (sides) vary between 0 and 1, thus determining that the sine and cosine do the same.

All of the other ratios (tangent, cotangent, secant, cosecant) have a side as the denominator, varying between 0 and 1. As any denominator approaches 0, the value of the ratio approaches infinity.

Find the measure of angle A.
60x
O 60°
O 30°
O 23°
O 37°
30x
A

Answers

Answer:

Step-by-step explanation:

sum of angles in a triangle=180º

90+60x+30x=180

90+90x=180

90(1+x)=180

1+x=2

x=1

angle A=30º

Consider the following triangle.
A right triangle. The side opposite to theta is 5 meters and the side adjacent is 6 meters.
Determine the measure of the angle represented by Theta using the inverse tangent function.
a.
50.2º
b.
56.4º
c.
39.8º
d.
33.6º

Answers

Answer:

Step-by-step explanation:

tan theta=5/6

theta=tan-1(5/6)

        =39.8º

Identify the area of a regular hexagon with side length 14in. rounded to the nearest tenth.

Answers

The area of a regular hexagon with side length 14 inches is 509.22 square inches.

Given that, a regular hexagon with side length 14 inches.

We know that, area of a regular hexagon can be calculated using A=3√3/2 a².

Here, area of a regular hexagon = 3√3/2 ×14²

= 3√3 ×98

= 509.22 square inches

Therefore, the area of a regular hexagon with side length 14 inches is 509.22 square inches.

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Reasoning What is the height of the square​ pyramid? Use pencil and paper. Once you know which length represents the​ hypotenuse, does it matter which length you substitute for a and which length you substitute for​ b? Explain.

Answers

The height of the pyramid is 30.14 in

We have,

Using the Pythagorean theorem,

Hypotenuse = 32.6 in

Base = 24.8/2 = 12.4 in

Height = x

Now,

32.6² = 12.4² + x²

x² = 1062.76 - 153.76

x² = 909

x = 30.15

Thus,'

The height of the pyramid is 30.14 in

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What are the angles of rotation for a regular
pentagon? (Select all that apply)
al. 60
672
(C) 90
d) 144
(l/180
1216
g) 360

Please show work or give an explanation please

Answers

The angles of rotation for a regular pentagon are:

b) 72°d) 144°f) 216°g) 360°

Pentagon angle of rotation explained

A Regular Pentagon has five equal sides and five equal angles.

Since the sum of the interior angles of a polygon with n sides is given as:

(n-2) x 180°, then we have:

(5-2) x 180 = 540°.

Note that n = sides of pentagon which is 5

Since all angles in a regular pentagon are equal, each angle measures (540/5) = 108°.

The angles of rotation for a regular polygon are given by the formula 360/n, where n is the number of sides.

Therefore, the angles of rotation for a regular pentagon is:

360/5 = 72°,

Any other angles will be in the multiple of 72. Therefore we have:

2 x 72 = 144°, 3 x 72 = 216°,4 x 72 = 288°5 x 72 = 360°

Note that a full rotation is 360°.

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A carnival game has 160 rubber ducks floating in a pool. The person playing the game takes out one duck and looks at it.

If there’s a red mark on the bottom of the duck, the person wins a small prize.

If there’s a blue mark on the bottom of the duck, the person wins a large prize.

Many ducks do not have a mark.

After 50 people have played the game, only 3 of them have won a small prize, and none of them have won a large prize.

Estimate the number of the 160 ducks that you think have blue marks.

Answers

The estimated number of the 160 ducks that have blue marks would be 5 ducks.

How to estimate the number ?

Assuming none of the 50 people have received a considerable reward, it is probable that winning a small prize bears higher odds than claiming a more substantial one. Estimating, the probability of achieving a large prize may be considered half as likely to succeed as obtaining a smaller sum:

P ( large prize ) :

= 0.5 x P(small prize)

= 0.5 x 0.06 = 0.03

Number of ducks with blue marks (large prize):

= ( total number of ducks ) x P( large prize )

= 160 x 0.03

= 4.8

= 5 ducks

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Rectangle WXYZ is dilated by a factor of 3 to make rectangle W'X'Y'Z. What is the perimeter of rectangle W'X'Y'Z?

Answers

The perimeter of rectangle W'X'Y'Z is 16 units

Perimeter of rectangle:

he rectangle has four sides. There are two lengths and two widths in a rectangle. Therefore, the perimeter of the rectangle is twice the sum of two adjacent sides that are length and width. The formula is given by:

Perimeter of rectangle = 2(l + b)

We have :

Rectangle WXYZ will be the dilated by a scale factor of 1/2 creating rectangle W'X'Y'Z'

So, By the image:

The analysis will be the:

Rectangle of WXYZ = 2 × 4

and, The rectangle of W'X'Y'Z' = 2 × WXYZ

                                                   = 16

W'X' = 4

W'Z' = 4

Hence, The perimeter of rectangle is = 4 + 4 + 4 + 4 = 16

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The given question is incomplete, So i take the similar question :

Rectangle WXYZ will be the dilated by a scale factor of 1/2 creating rectangle W'X'Y'Z'. What is the perimeter of rectangle W'X'Y'Z?

And also to see the attachment.

What is the probability that either event will occur?
12
A
4
B
24
P(A or B) = P(A) + P(B)
P(A or B) = [?]
Enter as a decimal rounded to the nearest hundredth.

Answers

From the given information, the probability that either event will occur is 0.7.

From the given Venn diagram,

Number of A = 4

Number of B = 24

Number of others  = 12

Total number = A + B + others = 4 + 24 + 12 = 40

Probability of event A occurring = number of A / Total number = 4/40 = 1/10 = 0.1

Probability of event B occuring = number of B / Total number = 24/40 = 3/5 = 0.6

Now, the probability of either event will occur = P(A or B) = P(A) + P(B)

P(A or B)  = 0.1 +0.6 = 0.7

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Write the quadratic equation in standard form:
-12x + x² + 14 = -5x

Answers

I Got u Bro Answer: x2-7x+14=0

Answer:

Step-by-step explanation:

X^2-7x+14=0

Find the indicated confidence interval. Assume the standard error comes from a bootstrap distribution that is approximately normally distributed.

Answers

The 95% confidence interval is (22.8876, 49.1124)..

To find the 95% confidence interval for the difference in means between two populations, we can use the formula:

CI = (x1 - x2) ± z*(SE)

where x1 and x2 are the sample means of the two populations, SE is the standard error, z is the critical value from the standard normal distribution corresponding to the level of confidence.

Substituting the given values into the formula, we have:

CI = (264 - 228) ± 1.96*(6.69)

Simplifying this expression, we have:

CI = 36 ± 13.1124

Therefore, the 95% confidence interval for the difference in means between the two populations is (22.8876, 49.1124).

This means that we are 95% confident that the true population difference in means falls between 22.8876 and 49.1124. We can interpret this interval as a range of plausible values for the population difference in means, based on the sample data.

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7 -6 2
If A = 6
6 -5 -7
2
-8
8
and B =
CERE
-8 -7 5
-1
-9
5
9 -4
7, find A + B.

Answers

Answer:

To find A + B, we need to add the corresponding entries of A and B. That is,

A + B = [a_ij + b_ij],

where a_ij and b_ij are the entries of A and B, respectively, in the ith row and jth column.

Using this formula, we get:

A + B = 7 + (-8) -6 + (-7) 2 + 5

6 + (-1) 6 + (-9) -5 + 4

-5 + 9 -7 + 5 8 + (-4)

= -1 -7 7

5 1

4

Therefore, A + B is the matrix:

-1 -7 7

5 1

4

Gunther Jr. High School has a student to teacher ratio of 25 to 2. Which of the following rational numbers is an equivalent representation of this ratio?

Answers

Answer:

Step-by-step explanation:

To find an equivalent ratio with smaller numbers, we can divide both 25 and 2 by their greatest common factor, which is 1:25 ÷ 1 = 25

2 ÷ 1 = 2Therefore, the ratio can be written as:25 : 2To write this ratio as a rational number, we can divide 25 by 2:25 ÷ 2 = 12.5So an equivalent representation of the ratio 25 : 2 is the rational number 12.5.

Please help me geometry too hard

Answers

The value of distance between two points on graph is,

⇒ d = √32 units

We have to given that;

The coordinates of two points are,

⇒ (9, - 4) and (5, -8)

We know that;

The distance between two points (x₁ , y₁) and (x₂, y₂) is,

⇒ d = √ (x₂ - x₁)² + (y₂ - y₁)²

Hence, The value of distance between two points on graph is,

⇒ d = √ (x₂ - x₁)² + (y₂ - y₁)²

⇒ d = √ (5 - 9)² + (- 8 - (-4))²

⇒ d = √ 16 + 16

⇒ d = √32

Thus, The value of distance between two points on graph is,

⇒ d = √32 units

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Find that the radius of curvature of ^2y=x^3-a^3
at the point where the
curves cut the X-axis.

Answers

The radius of curvature of the curve [tex]a^{2y[/tex]=x³-a³ at the point where the curve intersects the x-axis is 27[tex]a^{\frac{3}{2}[/tex].

To find the radius of curvature of the curve [tex]a^{2y[/tex]=x³-a³ at the point where the curve intersects the x-axis, we need to first find the equation of the curve and then determine the value of y and its derivative at that point.

When the curve intersects the x-axis, y=0. Therefore, we have:

a⁰ = x³ - a³

x³ = a³

x = a

Next, we need to find the derivative of y with respect to x:

dy/dx = -2x/(3a²√(x³-a³))

At the point where x=a and y=0, we have:

dy/dx = -2a/(3a²√(a³-a³)) = 0

Therefore, the radius of curvature is given by:

R = (1/|d²y/dx²|) = (1/|d/dx(dy/dx)|)

To find d/dx(dy/dx), we need to differentiate the expression for dy/dx with respect to x:

d/dx(dy/dx) = -2/(3a²(x³-a³[tex])^{\frac{3}{2}[/tex]) + 4x²/(9a⁴(x³-a³[tex])^{\frac{1}{2}[/tex])

At x=a, we have:

d/dx(dy/dx) = -2/(3a²(a³-a³[tex])^{\frac{3}{2}[/tex]) + 4a²/(9a⁴(a³-a³[tex])^{\frac{1}{2}[/tex]) = -2/27a³

Therefore, the radius of curvature is:

R = (1/|-2/27a³|) = 27[tex]a^{\frac{3}{2}[/tex]

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What is the sum?
X
3
2
+
x+3 x+3 " x+3
0
+
5
X+5
x+3
X+5
3x+27
Ex
x+3

Answers

Answer: 2, 2, 135, 9, 5, 35, 15, 10, 15, 15

Step-by-step explanation:

why does area and perimeter change in different ways

Answers

Answer:

Step-by-step explanation:

Area and perimeter are both measurements used to describe geometric shapes, but they are fundamentally different concepts and therefore change in different ways.The perimeter of a shape is the distance around the outside of the shape. It is a measure of the total length of the boundaries or sides of the shape. Perimeter depends on the length of each side of the shape, and if one or more sides change in length, the perimeter will change accordingly. For example, if you take a square and double the length of one of its sides, the perimeter will double as well.On the other hand, the area of a shape is the measure of the surface enclosed by the shape. It is a measure of the amount of space inside the shape. The area depends on the length and width of the shape, and if one or both of these dimensions change, the area will change accordingly. For example, if you take a square and double the length of one of its sides, the area will increase by a factor of four.In summary, the perimeter of a shape depends on the length of its sides, while the area of a shape depends on its length and width. Therefore, changes to the length of a side will affect the perimeter, but not necessarily the area, while changes to the length or width will affect the area, but not necessarily the perimeter.

Needing help finding this answer! ​

Answers

Answer:

78.947%

Step-by-step explanation:

It says A OR B, so:

5/19 + 6/19 + 4/19

11/19 + 4/19

15/19 = approx. 0.78947 = 78.947%

Find the 12th term of the geometric sequence 7,−21,63,

Answers

The 12th term of the geometric sequence is -1,240,029

How to find the 12th term of the sequence?

The general formula for the nth therm is:

A(n) = A(1)*(r)^(n - 1)

Where A(1) is the first term, in this case 7.

r is the common ratio, to get it, take the quotient between two consecutive terms:

-21/7 = -3

Then the formula is:

A(n) = 7*(-3)^(n - 1)

The 12th term will be:

A(12) = 7*(-3)^(12 - 1) = -1,240,029

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(X-3)/4+(x-1)/5-(x-2)/3=1

Answers

i Got u Bro! Answer:X=8x/15+77/15

:D

Find the value of x in the figure below 53° ,24° and x°

Answers

Answer:46

Step-by-step explanation:

traingle ABD = 53 + 24 + 47 + x = 180

134+x=180

x=180-134

x=46

Given that a/b=3/4 and b/c=5/6 find a:b:c Give you answer in its simplest form

Answers

Answer:

LCM of 4 and 5 is 20.

a/b = 3/4 = 15/20

b/c = 5/6 = 20/24

a:b:c = 15:20:24

The sun of the 2 digits of a certain number is 5. If 9 is added to the original number, the new number will have the original digits reversed. Find the number

Answers

Answer:

23

Step-by-step explanation:

Assume the digits are

1, 4 or 2,3

The number can be 14, 41, 23, 32

Test each one:

14 + 9 = 23 does not work

41 + 9 = 50 does not work

23 + 9 = 32 works

32 + 9 = 41 does not work

the coordinate grid shows 4 locations. Each unit on the grid represents 1 city block. Jeremiah walk twice around the rectangular path connecting the four locations. how many city blocks does Jeremiah walk

Answers

From the graph, Jerimiah walks along 44 city blocks.

Hence the correct option is (D).

It is given that each unit on the grid represents 1 city block.

From the given graph we can see that

Number of city block between Restaurant and Museum = 7

Number of city blocks between Museum and Hotel = 4

Number of city blocks between Hotel and Arena = 7

Number of city blocks between Arena and Restaurant = 4

Total number of city blocks along the rectangular path = (7 + 4 + 7 + 4) = 22 city blocks.

Jerimiah walks twice around the rectangular path.

So Jerimiah walks through = 2*22 = 44 city blocks.

Hence the correct option will be (D).

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Where are neurophatic ulcers likely to occur? the river perspective on time is for the analytical planner with a present focus; someone who views time as something that allows for enjoyment of life...for this reason, such people tend to seek out opportunities for hedonic consumption. group of answer choices true false . In ABC, m < B = 14, m < C = 42 and a = 34. Find the length of b to the nearest tenth. socrates spent his life questioning his fellow citizens about moral concepts. his utmost goal was to awaken his fellow citizens to the search for moral knowledge. T/F in a photoelectric effect experiment you illuminate potassium with 240-nm light. the work function of potassium is 2.3 ev. show answer no attempt what stopping potential, in volts, do you measure?in a photoelectric effect experiment you illuminate potassium with 240-nm light. the work function of potassium is 2.3 ev. show answer no attempt what stopping potential, in volts, do you measure? What are reasonable annual management fees for index funds?. Locate the brand in the minds of the consumers to maximize potential benefit,This is the goal of What is stored in data after this runs?vector data{1, 2, 3};data.front(); After previewing and cleaning your data, you determine what variables are most relevant to your analysis. Your main focus is on Rating, Cocoa.Percent, and Company.Location. You decide to use the select() function to create a new data frame with only these three variables.Assume the first part of your code is: trimmed_flavors_df %Add the code chunk that lets you select the three variables.select(Rating, Cocoa.Percent, Company.Location) What company location appears in row 1 of your tibble? b.dr. james lighthouse has just graduated from stony brook university with a dental degree. he got his license to practice dentistry. but he has no office to practice in. his dad is building a dental office for him and it will be ready for practice in 3 months. what kind of unemployed person is dr. lighthouse considered? Song and Prakash are both taking a very difficult and quite boring class in symbolic logic. Song is taking the class because she thought it would be interesting; Prakash is taking the class because it is required for his major. Mia asks them both what the class is like. Based on cognitive dissonance theory, you could predict that Song would say it is _____ and Prakash would say it is _____. Components can be removed from a GameObject if they are no longer needed (T/F): Find two nontrivial functions f(x) and g(x) so f(g(x)) = -5/(x+4)^4 You are in charge of a team of systematists whose job it is to classify a newly discovered animal species. Your initial studies reveal that your specimen has tissues, organs, a head, and a pseudocoelom, has no segmentation, and has bilateral symmetry. To what phylum does this animal belong?. if a company believes its sales returns will be material, an adjusting entry for expected returns should be made to which account? multiple choice question. accounts receivable sales discounts sales returns bad debt expense How to Create a new Incident record and populate the fields with the values? Which of the following is (are) characteristics of the X-ray tube? 1. the target material should have a high atomic number and high melting point2. the useful beam emerges from the port window3. the cathode assembly receives both low and high voltage your cute bunny has lept out of her cage and has chewed the cord to your desk lamp, which has created a short circuit an electric connection from one wire to the other inside the cord. when you plug the lamp into the electric outlet, group of answer choices current will flow alternately through the bulb and through the short circuit. excessive current will pass through the bulb. current will bypass the bulb. the bulb will blink on and off rapidly. the bulb will glow very brightly. the bulb will not light up. Write an explicit formula for an, the n^th term of the sequence 2,8,32,.... Question 16 of 20Which statement is true about the industrialization of the United States andJapan?OA. Russia supplied both the United States and Japan with their firstindustrial technologies.OB. Both the United States and Japan were forced to industrialize byforeign powers.OC. Great Britain industrialized before either the United States orJapan.O D. Both the United States and Japan industrialized without anyinfluence from other countries.SUBMIT