In a recent survey of 655 working americans ages 25-34, the average weekly amount spent on lunch was $43.29 with standard deviation $2.75. The weekly amounts are approximately bell-shaped

Answers

Answer 1

Answer:

99.7%

Step-by-step explanation:

Given that:

sample size (n) = 655

sample mean ([tex]\overline x[/tex]) = 43.29

Standard deviation [tex]\sigma[/tex] = 2.75

Let's assume we are to estimate the percentage between $33.72 and $51.54

Then;

The test statistics at 33.72 is :

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

[tex]Z = \dfrac{33.72 -43.29}{2.75}[/tex]

[tex]Z = -3.48[/tex]

Z at 51.54

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

[tex]Z = \dfrac{51.54 -43.29}{2.75}[/tex]

[tex]Z = 3.00[/tex]

Using the empirical standard rule, the percentage will be 99.7%


Related Questions

What is the domain of f )= 4?

Answers

The domain of f(x) = 4 is the set of all real numbers.

The domain of any constant function (where the output is always the same) is the set of all real numbers. This is because any real number can be plugged into the function, and the output will always be 4.

The domain of f(x) = 4 is the set of all real numbers, including integers, rational numbers, irrational numbers, and any other types of real numbers.

The domain of f(x) = 4 is the set of all real numbers.

The domain of any constant function (where the output is always the same) is the set of all real numbers. This is because any real number can be plugged into the function, and the output will always be 4.

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Why do people say geometry is hard?

Answers

Due to the lack of spatial thinking instruction in most math classes, people say geometry is hard. People should acquire geometrical ideas easily instead.

Who named geometry?

The father of geometry, Euclid was a brilliant mathematician. The terms "ge" and "metria," which both imply "measuring," are the origins of geometry. For more than 2000 years, the Greeks' method of approaching geometry has served as the foundation for geometry.

The study of various mathematical or actual-world forms, figures, and sizes is known as Geometry. We learn about various angles, transformations, and similarities between the forms in geometry. The point, line, and plane are the main building blocks of geometry.

Everyone finds it difficult to dive into the issue of proofs. Children must realize that this issue affects everyone, even the mathematically skilled. Because they have trouble seeing how 3D, and 2D, forms, angles, and lines connect from various viewpoints, most youngsters struggle with geometry issues. Even kids who are really good at solving sum problems in math might be utterly stumped by this.

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Due to the lack of spatial thinking instruction in most math classes, people say geometry is hard. People should acquire geometrical ideas easily instead.

Who named geometry?

Euclid, the inventor of geometry, was a master mathematician. The words "ge" and "metria," both of which denote "measuring," are where geometry got its start. The way the Greeks approached geometry has been the basis for geometry for more than 2000 years.

Geometry is the study of different mathematical or real-world shapes, sizes, and figures. Geometry teaches us about numerous angles, transformations, and similarities among forms. The primary components of geometry are the point, line, and plane.

Everyone finds it challenging to explore the topic of proofs. Children need to understand that this problem impacts everyone, even those who are good at arithmetic. Most kids have problems with geometry because they have trouble recognizing how 3D and 2D shapes, angles, and lines link from different views. Even children who excel at math sum problems may be completely baffled by this.

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Change 20.4 yards to inches.

Answers

Answer: 734.4 inch

Step-by-step explanation:

Answer:

734.4 is the correct answer

What is the slope of 5y =- 10?

Answers

The slope of line equation 5y = -10 is m = 0.

There are three type of the equation of line:

- slope-intercept form.

The equation of line is: y = mx + b

Where:

m = slope

b = y-intercept

- point-slope form

The equation of line is: y - y₁ = m(x - x₁)

Where:

m = slope

(x₁,y₁)  = a point on the line

- standard form

Ax + By + C = 0

Where A, B, C are constant

The given equation of line is: 5y = -10

Convert it first to slope-intercept form. Divide both sides by 5:

5y/5 = -10/5

y = -2

Then, compare with slope intercept form: y = mx + b

Note that y = -2 can be written as:

y = 0 ·x - 2

Hence, the slope = m = 0

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What is the value of x in the triangle? an isosceles right triangle with two legs of length 10 and hypotenuse of length x.

Answers

After using the Pythagorean theorem, the hypotenuse of the length x is 14.14 cm

In this case, we are given that:

The isosceles right triangle has two legs with length 10 cm

Let’s assume leg 1 as “a” = 10 cm, and leg 2 as “b” = 10 cm

The length of hypotenuse is “c”

To find the value of the hypotenuse or the longest side of a right triangle, we can use Pythagorean theorem:

a² + b² = c²

10² + 10² = c²

200 = c²

c = √200 =  14.14 cm

Therefore, the length of the hypotenuse would be 14.14 cm

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i need help hurryyy !!

Answers

Answer: 3

Step-by-step explanation: -4 1/3 divided by 2 1/5 = -1  32/33

Answer:

-1 32/33

Step-by-step explanation:

Negative divided by positive is negative.

We know the answeer will be negative.

Now ignore the signs, and just divide the mixed numerals.

1. Convert the mixed numerals to fractions.

2. Divide.

3. Convert quotient back to mixed numeral.

4. Make answer negative.

1.           4 1/3 ÷ 2 1/5 = 13/3 ÷ 11/5

2.          = 13/3 × 5/11 = 65/33

3.          = 33/33 + 32/33 = 1 32/33

4.          Answer: -1 32/33

Write the equation of the line represented by the following graph​

Answers

Answer:

Y=-[tex]\frac{1}{2}[/tex] + 4

Step-by-step explanation:

You will be using the equation of Y= Mx+B

First you must find the Y intercept, where the line crosses the Y axis, this is at positive four, this will be your B value. then you find the slope by picking 2 easily readable points on the graph, to do this i will choose (0,4) and (2,3), then you find the change in Y and put it in a fraction over the change in x, since this is going down the slope will have a negative infront of it, so your fraction is [tex]\frac{3-4}{2-0}[/tex] which equates to [tex]\frac{-1}{2}[/tex] so your slope is -1/2 (this is M value)

so lastly you plug it all in, Y= -1/2x+4

How do the graphs of the functions f(x) = (3/2)x and g(x)

Answers

The function g(x) = (2/3)ˣ is the graph of the function f(x) = (3/2)ˣ reflected over y-axis.

What is function?

A function is a process or a relation that associates each element 'a' of a non-empty set A , at least to a single element 'b' of another non-empty set B. A relation f from a set A (the domain of the function) to another set B (the co-domain of the function) is called a function in math.

f = {(a, b)| for all a ∈ A, b ∈ B}.

Given, the function

f(x) = (3/2)ˣ

g(x) = (2/3)ˣ

We have to compare the graphs of the functions f(x) and g(x).

Exponential function is of the form: y = abˣ

Where a is the initial value and b is the growth factor.

a) If b > 1, then the function is an exponential growth function.

b) If 0 < b < 1, then the function is an exponential decay function.

f(x) = y = (3/2)ˣ

The function is an exponential growth function.

The rule of reflection over y-axis:

(x, y) → (-x, y)

Applying the rule, we get,

(3/2)ˣ = (3/2)⁻ˣ

= (2/3)ˣ

= g(x)

Therefore, g(x) is graph of f(x) reflected over y-axis

Hence, graph of the function f(x) = (3/2)ˣ  reflected over y-axis is function g(x) = (2/3)ˣ .

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Which of the angles measures more than 90 but less than 180?

Answers

Answer:

Isosceles triangle

Step-by-step explanation:

Isosceles triangle has more than 90 but less than 180, which means Isosceles triangle is equal to 120.

Two sides of a triangle each measure 8 inches.
Maria says the triangle must be isosceles. Is Maria correct? Explain.

A.
No; the third side could measure 9 inches or 7 inches, and the triangle would be scalene.

B.
Yes; an isosceles triangle has at least two sides that have equal measures.

C.
Yes; the third side could measure 9 inches, and the triangle would be equilateral.

D.
No; the third side of the triangle could be 8 inches, and the triangle would be acute.

Answers

Answer:

B.) An isosceles triangle has at least two sides with equal measures.

Step-by-step explanation:

There are two equal sides and two equal angles in an isosceles triangle. There should be at least 2 equal sides for an Isosceles triangle. This means, even an equilateral triangle is an Isosceles triangle. In this case, at least two equal sides are 8 inches each. This is why the correct answer is 'Yes; an isosceles triangle has at least two sides that have equal measures.'

Write a function in terms of $t$ that represents the situation.

Sales of $10,000 increase by 65% each year.

Answers

A function in terms of t that represents the situation of sales that is of $10,000 and increase by 65% each year is t = 10,000(1.65)ⁿ.

What is function?

An element of one non-empty set and an element of another non-empty set are said to have a special relationship when they are connected by a function in mathematics.

An assignment of an element from set Y to each element of set X, where set X is the domain and set Y is the codomain, is what is meant when a function is applied from a set X to a set Y.

We have given that f(t) is given by the Sales of $10,000 increase by 65% each year, i.e.

As sales of $10,000 increase by 65% each year.

The situation is represented by an exponential growth function.

The initial amount a = 10,000

The rate of growth r = 65% = 0.65

Therefore, the function will be:

                                                   t = a(1 + r)ⁿ                                                  

Where,

t represents the final amount.

a represents the initial amount

r represents the rate of growth

1+r represents the growth factor

n represents the time.

⇒  t = a(1 + r)ⁿ      

⇒  t = 10,000(1 + 0.65)ⁿ    

⇒  t = 10,000(1.65)ⁿ    

Thus, a function in terms of t that represents the situation of sales that is of $10,000 and increase by 65% each year is t = 10,000(1.65)ⁿ.    

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Brooklyn divides 2.84 kilograms of fruit salad equally among 4 serving bowls.she wants to know how many kilograms of fruit salad to put in each bowl.she uses the decimal grids shown

Answers

By taking a quotient between the mass of salad fruit and the number of bowls, we will see that she needs to put 0.71 kg of salad fruit on each.

How much she needs to put in each bowl?

Here we know that Brooklyn wants to divide 2.84 kilograms of fruit salad equally among 4 serving bowls.

So, to see the mass of fruit salad that she needs to put in each bowl is equal to the quotient between the total mass of frit salad and 4, then we will get:

N = 2.84kg/4

N = 0.71 kg

So she needs to put 0.71 kilograms of salad fruit on each one of the 4 bowls.

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Lana want to encloe a garden plot each ide of the garden will be 9 feet what i the area of the garden

Answers

The area of the garden is 81 square feet (9 x 9).

Since each side of the garden plot is 9 feet, then the area of the garden plot can be calculated by multiplying 9 feet by 9 feet, which is equal to 81 square feet.

To calculate the area of the garden plot, we need to know the length and width of the plot. Since the length and width of the garden plot is both 9 feet, then the area of the garden plot can be calculated by multiplying the length and width together. 9 feet multiplied by 9 feet is equal to 81 square feet, which is the area of the garden plot.

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Why is it called equation?

Answers

The definition of an equation in algebra is a mathematical statement that proves two mathematical expressions are equal.

what is equation?

Consider the equation 3x + 5 = 14, where 3x + 5 and 14 are two expressions that are separated by the word "equal." The slope-intercept form, standard form, and point-slope form are the three primary forms of linear equations. A mathematical expression known as an equation contains the equals sign. Algebra is a significant component of many equations. When you don't know the exact number to compute in math, you use algebra.

given

The definition of an equation in algebra is a mathematical statement that proves two mathematical expressions are equal.

Consider the equation 3x + 7 = 14, where 3x + 7 and 14 are two expressions that are separated by the symbol "equal."

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Magnolia ha a net aet of P142,234. 00 after liabilitie of P53,435. 00 at the end of the
year. What i it equity at year end?

Answers

Magnolia ha a net aet of P142,234. 00 after liabilitie of P53,435. 00 at the end of the year. Then the  equity at year end become 88799

magnolia ha a net aet of P142,234. 00 after liabilitie of P53,435. 00 at the end of the

year. What i it equity at year end?

The ideal current ratio for a company is between 1.2 and 2, which indicates that it has two times as many current assets as liabilities to cover its debts.

If the current ratio is less than 1, the company's liquid assets are insufficient to cover its current liabilities.

equity = assets - liabilities

      = 142234-53435

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Can someone please help me

Answers

Therefore , the solution of the given problem of triangle comes out to be x = 32.376 side of the hypotunse length.

What precisely is a triangle?

Since a triangle has four or even more sections, it is a polygon. It has an easy geometric form. Triangle ABC refers to a square with angles A, B, & C. A singular plane and square are produced by Euclidean geometry whenever the sides are still not collinear. A triangle is a polygon if it has 3 components and three corners. Where a triangle's three sides come together are known as the corners. A triangle's angles add up to 180 degrees.

Here,

Given:

Triangle having :

=> Sin 78° =  h /30

=> 0.9781 = h /30

=> h = 30 * 0.9781

=>h =29.343

and

For x :

=> Sin 65° = 29.343 /x

=> 0.9063 = 29.343 /x

=> x = 29.343 / 0.9063

=> x = 32.376

Therefore , the solution of the given problem of triangle comes out to be

x = 32.376 side of the hypotunse length.

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I need help with this pls.

Answers

The number of sessions will be 5 and the cost is $249.

What is an expression?

The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.

Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.

Given that for the first plan, the initial cost is $39 and the cost per session is $42 and for the second plan, initial cost is $54 and per session is $39.

The number of sessions for same cost of two plans will be calculated as,

39 + 42S = 54 + 39S

42S - 39S = 54 - 39

3S = 15

S = 5

For 5 sessions the cost will be calculated as,

Cost = 39 + 42S

Cost = 39 + ( 42 x 5 )

ost = 39 + 210

Cost = $249

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Which of the following could be the units for dy/dx if y is the surface area of a tumor and x is the radius of the tumor

Answers

The units (derived unit) for dy/dx will be option C i.e. square millimeter per milimeter.

What are units?

Unit is a quantity of constant magnitude which is used to measure the magnitudes of other quantities of the same manner.

There seven SI base units, which are comprised of:

Length - meter (m)

Time - second (s)

Amount of substance - mole (mole)

Electric current - ampere (A)

Temperature - kelvin (K)

Luminous intensity - candela (cd)

Mass - kilogram (kg)

Derived units - A derived unit is a unit of measurement in the International System of Units (SI) that is derived from one or more of the seven base units.

As

Surface area(y) is mm^2

and radius(x) is mm

so, dy/dx will be mm^2/mm.

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how to graph y=-2/3x-5

-2x+3y=-15

Answers

By plotting the given points (0,-5) , (1,-17/3 ) for  y=-2/3x-5 and the points for-2x+3y=-15 are (0,-5) , (1,-13/3) and (2,-11/3) we get the required graph.

What is linear equation ?

Linear equation can be defined as the equation in which highest degree is one.

Given Equation,

y=-2/3x-5 and -2x+3y=-15

So,

use the slope form is

y= mx+b , where m is slope and b is the y-intercept.

find the valued of m an b using the form y = mx+b

m = -2/3 and b=-5

The slope of line is the value of m and y-intercept the value of b

slope = -2/3

Any line can be graphed using two points. Select two x values, and plug them into the equation to find the corresponding 2y values.

create a table for x and y values.

x    y

0   -5

1    -17/3

and soon

Similarly for -2x+3y=-15

x    y

0   -5

1    -13/3

2    -11/3

and soon

And Hence plot the points in the graph.

Therefore, By plotting the given points (0,-5) , (1,-17/3 ) for  y=-2/3x-5 and the points for-2x+3y=-15 are (0,-5) , (1,-13/3) and (2,-11/3) we get the required graph.

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Please help! Trig!!!!!!!l. Look at the image! And answer the question! Thank u!

Answers

Therefore , the solution to the given problem of trigonometry comes out to be Sin( θ) = Cos(90 -  θ).

Describe trigonometry.

Correlations between triangles' angles and sides are studied in the mathematics discipline known as trigonometry. Since every straight-sided form can be reduced to a collection of triangles, trig can be found throughout geometry. The relationships between trigonometric and other branches of mathematics, in particular calculus, either real or complex, integrals, square root, and integrals, are astonishingly complicated.

Here,

Below is a list of the trigonometric values that are missing:

Angle A =  θ-90.

28° sin = 62° cos

Cos 33° equals Sin 57°.

Cos 31° equals Sin 59°.

Sin( θ) = Cos(90 -  θ).

Therefore , the solution to the given problem of trigonometry comes out to be Sin( θ) = Cos(90 -  θ).

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Find the Equation of the line that goes through (2,7) and (-1.1)

*Graphically and Algebraically

Answers

In slope intercept form, the equation of the line is: y=2x + 3.

The start/initial value is (0, 3), which is the y-intercept.

The slope is 2. Use the formula (y_2 - y_1)/(x_2 - x_1) and substitute the two (x,y) points given: (2, 7) and (-1, 1). 6/3 simplifies to 2.

The 2 is represented by m in slope int. form where y=mx+ b. Then the 3 is represented by b, the y-intercept.

Here’s a picture to show the plotted points and work. I hope this helps:

What 2 - 3

5319
H





E








*-**


P

Answers

The answer is negative one, -1

What quadrant is 0degrees?

Answers

0 degrees is located in Quadrant I of the Coordinate Plane.

Quadrant I is the top right section of the coordinate plane, and it contains all the points where the x-coordinate and y-coordinate are positive. 0 degrees is the angle formed by the positive x-axis, and it is located in Quadrant I.

A coordinate plane is divided into four sections called quadrants, which are numbered I, II, III, and IV in a counterclockwise direction, starting with the top right.

This quadrant is defined by angles between 0 and 90 degrees and is generally associated with positive values on both the x- and y-axes.

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I need help on quiz 4-1 classifying and solving for sides/ angles

Answers

Step-by-step explanation:

I don't know because you have it to far

What is a 4 polygon?

Answers

A 4 polygon is a two-dimensional shape with four sides and four angles.

What is polygon?

Polygon is a closed figure in a plane made up of straight lines or curved lines that intersect in pairs. A polygon has at least three sides and angles. The sides can be of any length and the angles can be of any measure. Polygons are classified according to the number of sides they have, such as triangles (3 sides), quadrilaterals (4 sides), pentagons (5 sides), hexagons (6 sides), etc. Polygons are used in many fields, from mathematics to engineering.

It is a type of quadrilateral, which is a polygon with four sides. Examples of 4 polygons include squares, rectangles, rhombuses, and trapezoids. All 4 polygons have four sides of equal length, and all their interior angles add up to 360 degrees.

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Select all statements that are TRUE about the graph.


A.) The pre-image is in quadrant III.


B.) The orientation of the vertices changed.


C.) The reflection can be represented by (-x, y).


D.) The line of reflection is the x-axis.


E.) The pre-image and image are congruent
HELP ASAPP

Answers

The true statements are,

A.) The pre-image is in quadrant III.

B.) The orientation of the vertices changed.

D.) The line of reflection is the x-axis.

What is orientation of the vertices?

It is determined by the order in which a figure's vertices are labeled. It refers to the sequence of points after a transformation has been applied to a geometric figure. The order may be clockwise or counterclockwise.

Here, we have,

from the given figure ,we get,

the true statements are,

A.) The pre-image is in quadrant III.

B.) The orientation of the vertices changed.

D.) The line of reflection is the x-axis.

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You want to know how long the road marked x is and you know the lengths of the other two roads that form a right angle with the road, has the measurements to find the length marked x

Answers

5 miles if you follow the pythagorean theorem

MAKE THE ANSWER IS RIGHT!!! 100 points + Brainliest. 100 points + Brainliest Let C represents the cost in dollars and R represents the revenue in dollars. What is the break-even point? Use a table to help if necessary.
C=36x+200
R=76x
Break-even point: (,)

Answers

Answer: accidentally did that sorry

Step-by-step explanation:

What is the two steps in solving inequality?

Answers

Two steps in solving the inequality: simplify the algebraic expressions by combining like terms and isolating the target variable, then applying the mathematic operators.

Steps in solving the inequality:

-  Simplify the expression by: open the parentheses of algebraic expression, combine the terms like, and isolate the target variable.

- Use mathematic operators such as: addition, subtraction, multiplication, and division. All mathematic operations must be done on both sides. Addition and subtraction do not change the inequality. Multiplication and division with positive numbers will not change the inequality.

Multiplication and division with negative numbers will change the sign of the inequality.

Example:

Solve the inequality: 3x + 2 < 5x - 8

Step one: Subtract both sides with 5x and 2, this operation does not change the inequality sign

3x + 2 - 5x - 2 < 5x - 8 - 5x - 2

-2x < -10

Step two: Divide both sides with (-2). Since we divide with negative numbers, flip the inequality sign.

-2x/(-2) > -10/(-2)

x > 5

Hence, the solution is x> 5

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Jacob is roller skating. He can skate 3/10 of a mile in 1/2 of a minute. What is Jacobs unit rate in miles per minute? please answer this is 100% of my grade TwT

Answers

Answer:

[tex]\frac{3}{5}[/tex] miles per minute

Step-by-step explanation:

3/10 ÷ 1/2

3/10 x 2 = 6/10 = 3/5

Other Questions
However, the office is open for blood draws. Angie, a medical assistant, is in the office alone.Matt, a 17-year-old upcoming college freshman, has just arrived to have his labs drawn so that Dr. Joseph can complete Matts college physical. He is extremely nervous, although he is trying very hard to exhibit a relaxed manner. Angie tries to reassure Matt, but the more she tries, the more nervous he gets. At Matts urging to just get it over with, Angie decides to go ahead and draw his blood. Unfortunately, as soon as the first collection tube begins to fill with blood, Matt notices it and slumps forward. He has fainted.1. What is the first thing that Angie should do?2. Was Angie at all negligent in drawing Matts blood given that he was extremely nervous?3. Is this considered a medical emergency?4. Does an incident report of some sort need to be filed? If so, what should be included, and who should receive a copy? What is an algebraic expression for this word phrase? 7 more than the product of 5 and n A box contains twelve 16 GB pen drives and eighteen 32 GB pen drives. Two 16 GB pen drives are defective, and four 32 GB pen drives are defective. If a pen drive is picked at random, what is the probability that it is a 16 GB pen drive or defective? What is the main point of Gilgamesh? What are the similarities and differences between aerobic and anaerobic glycolysis? A sample compound with a formula mass of 34. 00 amu is found to consist of 0. 44 g h and 6. 92 g o. Find its molecular formula. Comprehension: Chapter Eight | Pages 48-54Read chapter 8 and respond to the following questions. Use complete sentences. Submit on paper!1. What book titles does Sierra notice when she gets into the library? Why do these surprise her? Older could have mentioned any titles here. Why do you think he chose these specific ones? What could his purpose be in choosing these? What statement is he making? (p. 48) (60 points)2. What kind of critique does Nydia offer of the field of anthropology? (50-51) (10 points)3. What was in Nevilles briefcase? How did he create the distraction that got Sierra into the library? What is the political statement or critique here? (p. 53-54) (30 points) 2. Why are the bricks "a blaze of heat"? Help with geometry similar triangles. Given AB || CD Find the length of BE. The only modes of communication are through the spoken and written word.truefalse How did Tom Watson attempt to shape The New South? Which event occurs first?A) Haemons deathB) Antigones deathC) Haemons attempt to stab Creon What is the tone and mood of The Weary Blues? Which of these best describes the attack on Pearl Harbor?Aa false alarmBan ineffective strikeCa catastrophic ambushDa setback to Americas war efforts aidan is going to buy movie tickets for his friends. matinee tickets are $5 each and evening tickets are $10 each. aidan can spend at most $50 dollars. write and graph an inequality to represent the number of matinee tickets, x, and evening tickets, y, Aiden can buy Question Law:If someone committed assault towards a police officer how long would they be sentenced to jail for? 1.Find the incorrect option:a. Proper fraction has a large denominator.b. Irrational number never end.c. Integer includes negative, zero and positive.d. Decimal number is called Hindu-Arabic number also.2.Which one of the following is a monomial?a. 2 + 3xb. 3 + xc. 5a x 36bd. 20 -1e. a e + 33.Which of the following is not correct for order of operation?a. BODMASb. PEMDASc. Calculation from left to rightd. Calculation of parenthesis is not possible before exponent operation.e. Calculation of division is not possible before multiplication operation. Complete the table below. some binary molecular compounds name; chemical formula disulfur heptoxide; ___ sulfur tetroxide; ___ disulfur trioxide; ___ sulfur dioxide; SO2 Can you spot any mistakes below?Q1. Make y the subject of the formula:k=y(squared)+ak =y+ak - a=yy=k-aQ2. Express in terms of tt=v/4+1t-1+v/4t-1/4=vPlease help I do not know if there are any mistakes What are the 4 elements of creating an effective presentation?