PLEASE HELP QUICKLY: (FIRST ANSWER GETS BRAINLIEST)

You are buying batteries, a stereo, and some CDs from the I.B. Electronics store. You can buy from this store online or in a physical store. You have a coupon for 10% off that can only be used in the physical store and a $5.00 off coupon that can only be used online. The sales tax of 5% only applies to the physical store. Shipping for the online store is a flat rate of $6.99. You are trying to decide whether to shop at the physical store or the online store. Using the pricing information below, how much money would you save by shopping in the physical store after all discounts, taxes, and shipping fees have been applied?

Item Quantity Physical Store Online Store
Batteries 2 packs $5.99/pack $4.99/pack
Stereo 1 system $100.00/system $90.00/system
CDs 3 CDs $7.95/CD $8.95/CD



$19.62




It is more expensive to shop in the physical store.




$0.46

Answer:

119 is the value of x when y = 7

Step-by-step explanation:

Since y varies inversely with x, we can use the following equation to model this:

y = k/x, where

Step 1:  Find k by plugging in values:

Before we can find the value of x when y = k, we'll first need to find k, the constant of proportionality.  We can find k by plugging in 49 for y and 17 for x:

Plugging in the values in the inverse variation equation gives us:

49 = k/17

Solve for k by multiplying both sides by 17:

(49 = k / 17) * 17

833 = k

Thus, the constant of proportionality (k) is 833.

Step 2:  Find x when y = k by plugging in 7 for y and 833 for k in the inverse variation equation:

Plugging in the values in the inverse variation gives us:

7 = 833/x

Multiplying both sides by x gives us:

(7 = 833/x) * x

7x = 833

Dividing both sides by 7 gives us:

(7x = 833) / 7

x = 119

Thus, 119 is the value of x when y = 7.

Answer:

the value of x is 5/7 which is in fraction

Answer:  x = 5/7

Step-by-step explanation:  2x/3 + x/2 =5/6

To use a least common denominator, divide LCD by the original denominator and multiply the original numerator by the result.

for 2x/3  6÷3=2  2×2x=4x so that becomes 4x/6

for x/2    6÷2=3  3× (invisible) 1 = 3x, so that becomes 3x/6

combine 4x/6 + 3x/6 = 7x/6  

Back to the original equation, substituting the calculated term:

7x/6 = 5/6   Multiply both sides by 6 to simplify (6)(7x/6) = (6)(5/6) 6's "cancel"

7x = 5 .  Divide both sides by 7 to solve for x  7x/7 = 5/7

x = 5/7

Answer:

Step-by-step explanation:

origin, multiply the coordinates of each vertex by the scale factor k. When k > 1, the dilation is an enlargement. When k > 0 and k < 1, the dilation is a reduction. In a dilation, the original figure and its image are similar.

Answer: 15 inches

Step-by-step explanation:

The pythagorean theorem is a^2 + b^2 = c^2

a is one side of the triangle

b is the other side of the triangle

c is the hypotenuse

In our case, a = 36 inches, b is unknown, and c is 39 inches.

If we use the Pythagorean theorem above (a^2 + b^2 = c^2) we get

36^2 + b^2 = 39^2

b^2 = 39^2 - 36^2

b^2 = 225

b = sqrt(225) = 15 inches

Answer:

Sorry but this is not really a question so we can't answer it

Answer:

that he lines are not going strait

Step-by-step explanation:

The length of the sides of ΔABC are; AB = 2√5, BC = √13, and AC = √17

The length of the sides of ΔDEF are; DE = 2√5, EF = √13, and DF = √17

By the SSS Congruence Theorem, ΔABC ≅ ΔDEF

We are given the coordinates of Triangles ABC and DEF as;

A(5, 3), B(7, 7), C(9, 4)

D(-8, 6), E(-12, 8), F(-9, 10)

The formula for distance between two coordinates is;

Distance = √[(y₂ - y₁)² + (x₂ - x₁)²]

Thus;

AB = √[(7 - 3)² + (7 - 5)²]

AB = √20

AB = 2√5

Similarly;

BC = √[(4 - 7)² + (9 - 7)²]

BC = √13

AC = √[(4 - 3)² + (9 - 5)²]

AC = √17

Likewise;

DE = √[(8 - 6)² + (-12 + 8)²]

DE = √20

DE = 2√5

Similarly;

EF = √[(10 - 8)² + (-9 + 12)²]

EF = √13

DF = √[(10 - 6)² + (-9 + 8)²]

DF = √17

Since the corresponding sides of the two triangles are equal and as such they can be said to congruent by SSS Congruency.

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Answer:

Length of EF is greater than the length of GH

Length of EF is 14.65 cm

Length of GH is 9.77 cm

Step-by-step explanation:

i dont know what the answer is but all i can say is to read it closely and try asking your teacher and\or parents to help you understand

Answer:

Option "A" is the correct answer.

Number of truck and car in parking is 64 , 80

Step-by-step explanation:

Given:

Sample ratio = 4 truck and 5 car

Find:

Number of truck and car in parking

Computation:

Sample ratio = 4 / 5

So,

Option 1

64 truck 80 cars

ratio = 64 / 80

ratio = 4 / 5

Option 2

72 truck 73 cars

ratio = 72 / 73

84 trucks 100 cars

ratio = 84 / 100

ratio = 21 / 25

96 truck 110

ratio = 96 / 110

ratio = 48 / 55

sample ratio match with option 1

So,

Number of truck and car in parking is 64 , 80

Implications of an empty row in the roof portion of the house of quality Customer requirements are potentially not being met by the product.

The house of quality serves as a form of conceptual road map for interfunctional communication and planning. In order to discuss design goals, people with various issues and responsibilities can refer to evidence patterns on the grid of the home.

Quality function deployment is a set of planning and communication procedures that concentrates and organises capabilities inside an organisation in order to first create, then manufacture, and finally sell products that consumers want to buy and will continue to buy. The idea that items should be high-quality is the cornerstone of the house of quality.

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Answer:

Perimeter of the triangle is 58

Step-by-step explanation:

create an equation

(x+3)2+(2x-1)2=(x-7)+(4x-8)+(3x+1)

2x+6+4x-2=x-7+4x-8+3x+1

combine like terms

6x+4=8x-14

18=2x

x=9

now we substitute in the expression to find the perimeter

9-7=2

36-8=28

27+1=28

2+28+28=30+28=58

The branch of mathematics that analyses the strategic behavior of decision-makers is known as game theory.

The branch of mathematics that analyzes the strategic behavior of decision-makers is known as Game Theory.

Game theory is the study of the mathematical modeling of social interactions between agents. [1] It has applications in all areas of the social sciences, including logic, systems science, and computer science. It was originally focused on a two-player zero-sum game where each player's win or loss equals the other player's win or loss. In the 21st century, game theory applies to many social relationships; is now the subject of research on decision-making in humans, animals, and computers. The modern theory begins with the idea of ​​a combination of competition in a two-player zero-sum game and its proof by John von Neumann.

Von Neumann's original proof of continuity in a linear system using Brouwer's fixed point theorem has become a standard in game theory and business mathematics. His research was based on the 1944 book Game Theory and Economic Behavior by Oskar Morgenstern, which deals with multiplayer cooperative games. The second edition of this book presents an axiomatic theory of expected utility that enables mathematical statisticians and economists to solve decisions in uncertainty.

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Answer:

length of string  ≈ 421  units (nearest whole number)

Step-by-step explanation:

Juliet is standing on the balcony 44 above the ground . The angle of depression is 6°. A string was held between Juliet and Romeo.

The illustration forms a right angle triangle. The hypotenuse of the triangle is the length of the string held by both star crossed lovers. The opposite side of the triangle is given as 44. Therefore,

using sin ratio

sin 6° = opposite/hypotenuse

sin 6° = 44/length of string

cross multiply

length of string sin 6° = 44

divide both sides by sin 6°

length of string = 44/sin 6°

length of string = 44/0.10452846326

length of string = 420.937978274

length of string  ≈ 421 units(nearest whole number)

We conclude that the mean commute time in the U.S. is less than half an hour.

We are given that a random sample of 500 people from the 2000 U.S. Census is selected who reported a non-zero commute time.

In this sample the mean commute time is 27.6 minutes with a standard deviation of 19.6 minutes.

Let  = mean commute time in the U.S..

So, Null Hypothesis, :  \(H_0:\) μ ≥  30 minutes    {means that the mean commute time in the U.S. is more than or equal to half an hour}

Alternate Hypothesis,  :   \(H_A\): μ  < 30 minutes     {means that the mean commute time in the U.S. is less than half an hour}

The test statistics that would be used here One-sample t-test statistics as we don't know about population standard deviation;

                          T.S. =  (X -μ)/\({\frac{s}{\sqrt{n} } }\)   ~ \(t_n_-_1\)

where,  X = sample mean commute time = 27.6 minutes

           s = sample standard deviation = 19.6 minutes

           n = sample of people from the 2000 U.S. Census = 500

So, the test statistics  =   (27.6 - 30)/\(\frac{19.6}{\sqrt{500} }\) ~ \(t_4_9_9\)

                                      =  -2.738

The value of t test statistic is -2.738.

Also, P-value of test statistics is given by the following formula;

          P-value = P( \(t_4_9_9\)   < -1.645)

Since, we know that at large sample size, the t distribution follows like normal distribution, that means;

             P( \(t_4_9_9\)  < -1.645)  =  P(Z < -1.645) = 1 - P(Z ≤ 1.645)

                                        =  1 - 0.95002 = 0.04998

Now, at 5% significance level the t table gives critical values of -1.645 at 499 degree of freedom for left-tailed test.

Since our test statistic is less than the critical value of t as -2.378 < -1.645, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which we reject our null hypothesis.

Therefore, we conclude that the mean commute time in the U.S. is less than half an hour.

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The length of each side of the octagon is 6 cm

It is a polygon with eight sides and eight angles. There are a total of 20 diagonals in it. All its interior angles sum up to 1080°.

Given that, a regular octagon has an area of 288 square centimeters and an apothem of 12 cm.

We need to find the side of the octagon,

We know that area of the octagon = 8/2 × side × apothem

Therefore,

288 = 8/2 × side × 12

side = 288 / 48

side = 6

Hence, the length of each side of the octagon is 6 cm

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The estimated probability that 3 or more kicks are made out of 5 attempts, with a 72% probability of success per kick, is approximately 82.44%.

To estimate the probability that 3 or more kicks are made, we can use the binomial distribution.

Let X be the number of successful kicks in 5 attempts. Then X follows a binomial distribution with parameters n = 5 and p = 0.72.

The probability of making exactly k kicks is given by the binomial probability mass function

\(P(X=k) = (n choose k) * p^k * (1-p)^{n-k}\)

where (n choose k) is the binomial coefficient, which gives the number of ways to choose k successes out of n trials.

To find the probability of making 3 or more kicks, we can sum the probabilities of making 3, 4, or 5 kicks

P(X >= 3) = P(X=3) + P(X=4) + P(X=5)

\(P(X=k) = (n choose k) * p^k * (1-p)^{n-k}\)

P(X=3) = (5 choose 3) * 0.72³ * (1-0.72)⁵⁻³ = 0.2787

P(X=4) = (5 choose 4) * 0.72⁴ * (1-0.72)⁵⁻⁴ = 0.3769

P(X=5) = (5 choose 5) * 0.72⁵ * (1-0.72)⁵⁻⁵ = 0.1688

P(X >= 3) = 0.2787 + 0.3769 + 0.1688 = 0.8244

Therefore, the estimated probability that 3 or more kicks are made is approximately 0.8244, or 82.44%.

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Answer:

\(A.\,\orange{ \bold{ \frac{x - 3}{3x + 1} }}\)

Step-by-step explanation:

\( \frac{x + 2}{ {x}^{2} + 5x + 6 } \div \frac{3x + 1}{ {x}^{2} - 9} \\ \\ = \frac{x + 2}{ {x}^{2} + 3x + 2x+ 6 } \div \frac{3x + 1}{ {x}^{2} - {(3)}^{2} } \\ \\ = \frac{\cancel{x + 2}}{ \cancel{{({x}+ 3)}} \cancel{(x+ 2) }} \times \frac{\cancel{( {x} + 3)}( {x} - {3)}}{3x + 1} \\ \\ = \purple{ \bold{ \frac{x - 3}{3x + 1} }}\)

Answer:

The answer is the first one - Additive Inverse.

Answer:

7(3 + 3x)  =  21x + 21

2d + 10(4d +4 + 2a)  =  20a + 42d + 40

3t + 2x + x  =  3t + 3x

5(r + 12) - 25  =  5r + 35

18s + 12rs + 10r - 2rs  =  10rs + 10r + 18s

s(12 - 4) + 2  =  8s + 2

w(15 - 3) + 2 + 7w  =  19w + 2

Step-by-step explanation:

Step-by-step explanation:

Let, the number of boys be x and number of girls be y.

\begin{gathered}\\Mean \: marks \: of \: boys \\ = \frac{Total \: marks \: of \: boys }{Total \: number \: of \: boys} \\ \\ 70 = \frac{Total \: marks \: of \: boys}{ x } \\ \\ Total \: marks \: of \: boys = 70x \: \: ......(1) \\ \\\\ Mean \: marks \: of \: boys \\ = \frac{Total \: marks \: of \: girls }{Total \: number \: of \: girls} \\ \\ 73 = \frac{Total \: marks \: of \: girls}{y} \\ \\ Total \: marks \: of \: girls = 73y \: \: .....(2) \\\\ \\ Mean \: marks \: of \: entire \: students \\ = \frac{Total \: marks \: of \:students}{Total \: number \: of \: students } \\ \\ Mean \: marks \: of \: entire \: students \\ = \frac{Marks \: of \:boys + Marks \: of \: girls}{ Number \: of \: boys + Number \: of \: girls } \\ \\ from \: eq \: (1) \: and \: (2) \\ \\ 71 = \frac{70x + 73y}{x + y} \\ \\ 71(x + y) = 70x + 73y \\ \\ 71x + 71y = 70x + 73y \\ \\ 71x - 70x = 73y - 71y \\ \\ x = 2y \\ \\ \frac{x}{y} = \frac{2}{1} \\ \\ \frac{Number \: of \: boys}{Number \: of \: girls} = \frac{2}{1} \\ \\\end{gathered}

Meanmarksofboys

=

Totalnumberofboys

Totalmarksofboys

70=

x

Totalmarksofboys

Totalmarksofboys=70x......(1)

Meanmarksofboys

=

Totalnumberofgirls

Totalmarksofgirls

73=

y

Totalmarksofgirls

Totalmarksofgirls=73y.....(2)

Meanmarksofentirestudents

=

Totalnumberofstudents

Totalmarksofstudents

Meanmarksofentirestudents

=

Numberofboys+Numberofgirls

Marksofboys+Marksofgirls

fromeq(1)and(2)

71=

x+y

70x+73y

71(x+y)=70x+73y

71x+71y=70x+73y

71x−70x=73y−71y

x=2y

y

x

=

1

2

Numberofgirls

Numberofboys

=

1

2

3588.3 thats the answer

The pantograph, invented by Christoph Scheiner in 1603, is an instrument that allows for the enlargement of images. It works based on the principles of similar triangles, utilizing a linkage system to replicate and scale diagrams.

The pantograph operates on the concept of similar triangles. It consists of a series of linkages connected by joints, with a pencil attached to one linkage and a pointer or stylus attached to another. When the pencil is moved along the original diagram, the linkages and joints replicate the movement onto the second linkage, causing the pointer or stylus to trace a scaled-up version of the original image.

The operation of the pantograph is directly related to dilations and similarity. Dilations involve scaling an object while maintaining its shape. In the case of the pantograph, the image is enlarged while preserving the proportions and shape of the original. This is achieved through the use of similar triangles. By arranging the linkages in a specific manner, the distances and angles between corresponding points on the original and replicated image form similar triangles. As similar triangles have proportional sides, the movement of the pencil is replicated on a larger scale, resulting in an enlarged image.

In modern times, the pantograph has been largely replaced by digital technologies such as scanners, printers, and software applications. These advancements allow for easier and more precise enlargement and replication of images. With the use of digital devices, images can be scanned and edited electronically, eliminating the need for physical linkages and manual scaling. The versatility and efficiency of digital methods make them the preferred choice for enlarging images in contemporary contexts.

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Answer:

Step-by-step explanation:

I'm going to assume you want it to be a perfect triangle, so then we would have the equation 4x=24. So we can divide each side by 4 to get rid of the 4 and get x by itself. So 24/4= 5. So x=5

Answer:

there is no answer, absolute value always > 0

Answer:

BCA is half of that of BCD. BCD is ~90 degrees, and BCA is ~45 degrees.

(~ meaning about)

Hope that helps

Answer:

Step-by-step explanation:

The formula for the surface area is A = 4πr².  This formula can be solved for r² and then the result solved for the radius, r:

         A

r² = --------     The radius of the sphere is as follows:

        4π

√(30 m²)

-------------- meters

     2√π

If it passes the horizontal lines test, it is a function.

A mathematical phrase, rule, or law that establishes the link between an independent variable and a dependent variable (the dependent variable). In mathematics, functions exist everywhere, and they are crucial for constructing physical links in the sciences.

Use the vertical line test to determine whether an expression is indeed a function; if so, the expression IS one.

In any case, if the graph passes the vertical line test first, indicating that it is a function, and IF then it also passes the horizontal line test, it indicates that it is not only a function but also a one-to-one function, meaning that there is a unique x-coordinate value for every unique y-coordinate value. However, if it passes the horizontal line test, it doesn't mean much functionally. What the heck is up with the horizontal line test anyway?

The inverse expression of a function is only true for one-to-one functions.

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