Which statement about f(x) = -x squared + 8x-7 is true?

The passengers selected for the in-flight survey in this scenario can be best referred to as a stratified random sample.

In stratified random sampling, the population is divided into smaller, non-overlapping groups, called strata, which share similar characteristics. In this case, the strata are the 40 flights selected by Northwest Airlines. From each of these strata, a random sample of passengers is chosen, which in this case, is a group of ten passengers from each flight.

This method ensures that each flight's passengers are represented in the survey, allowing for better generalizability of the results. By selecting passengers randomly within each stratum, the survey helps minimize selection bias and ensures that the sample reflects the diversity of the overall population of passengers. The stratified random sampling approach is especially useful when studying a large and diverse population, as it provides a more accurate representation of the population's characteristics compared to simple random sampling.

In summary, the passengers participating in the in-flight survey are best referred to as a stratified random sample because they are chosen from 40 randomly selected flights, with ten passengers randomly selected within each flight. This sampling approach ensures better representation of the overall population and helps minimize selection bias in the survey results.

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The value of p in the equation shown is 0.3

An equatiοn in writing prοving the similarity οf twο phrases. It is made up οf a series οf characters divided intο left and right sectiοns and cοnnected by an equal sign.

Equatiοns are questiοns, and the search fοr methοdical sοlutiοns tο thοse questiοns has fueled the grοwth οf mathematics. Simple algebraic equatiοns with οnly additiοn οr multiplicatiοn tο differential equatiοns, expοnential equatiοns with expοnential fοrmulas, and integral equatiοns are examples οf variοus types οf equatiοns.

The equation that is in the question is given below

p³ = -0.027

or, p=-∛0.027

or, p = -0.3

Hence the value of the p is 0.3

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Mrs. Simcox can make 4 complete batches of snickerdoodles for her class on Pi day, as she has 9 cups of flour and each batch of cookies requires 2 and 1/4 cups of flour.

Mrs. Simcox needs to make snickerdoodles for her class on Pi day and she knows that each batch of cookies requires 2 and 1/4 cups of flour. Therefore, she needs to calculate how many batches of cookies she can make with the 9 cups of flour that she has.

To do this, she divides the total amount of flour she has (9 cups) by the amount of flour required for each batch (2 and 1/4 cups). To simplify this division, she can convert the mixed number (2 and 1/4) to an improper fraction:

2 and 1/4 = (2 x 4 + 1)/4 = 9/4

Therefore, she can rewrite the division as:

9 cups ÷ 9/4 cups per batch

To divide by a fraction, she can multiply by its reciprocal:

9 cups × 4/9 cups per batch = 4 batches

So, Mrs. Simcox can make 4 complete batches of cookies with the 9 cups of flour she has.

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Based on the given frequency table, it takes between 150 and 160 minutes to fly from Denver to Atlanta on Delta Airlines for 25 out of 56 observations.

The table provides frequency data on flight times (in minutes) for the first week of March 2005 from Denver to Atlanta on Delta Airlines. The frequency table shows that there were 25 flights with a duration between 150 and 160 minutes, which is the most frequent flight duration. The flight times ranged from 140 to 190 minutes.

The frequency data can be used to construct a histogram that displays the distribution of flight times for the Denver to Atlanta route. The histogram can provide further insights into the distribution of flight times, such as whether the distribution is symmetric or skewed, and the location and spread of the data.

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--The complete question is, how long does it take to fly from denver to atlanta on delta airlines? the table below shows 56 observations on flight times (in minutes) for the first week of march 2005.

FROM      TO           FREQ

140         150            1

150         160            25

160         170            24

170         180            4

180         190            2--

This means that for x values less than or equal to -2, the function equals -2x - 1. For x values between -2 and 1, the function equals x^2 + 2x - 3. And for x values greater than or equal to 1, the function equals 4.

To express the function graphed on the axes below as a piecewise function, we need to analyze the graph and determine the different intervals where the function behaves differently.

Looking at the graph, we can see that the function is a straight line with a slope of 2 when x is less than or equal to -2. Then, the function changes to a parabola that opens upwards when x is between -2 and 1. Finally, the function becomes a horizontal line when x is greater than 1.

Therefore, the piecewise function that represents this graph is:

f(x) =
-2x - 1,    if x ≤ -2
x^2 + 2x - 3,    if -2 < x < 1
4,    if x ≥ 1

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Answer:

392

Step-by-step explanation:

Volume is the area of the base times the height.

Area of the base:

[tex]\frac{(8x14)}{2}[/tex] = 56

Volume:

area of the base times the height

(56)(7) = 392

Helping in the name of Jesus.

The incidence of skin cancer over the two years in the high exposure group is 24.39%.

To calculate the incidence of skin cancer over the two years in the high exposure group, follow these steps:
1. Determine the number of workers in the high exposure group: 800 workers
2. Subtract the initial skin cancer cases in the high exposure group from the total number of workers in the group to find out the workers without skin cancer:

800 - 185 = 615 workers
3. Calculate the number of new skin cancer cases in the high exposure group by subtracting the new cases in the low-exposure group from the total new cases:

175 - 25 = 150 cases
4. Calculate the incidence rate by dividing the new cases in the high exposure group by the number of workers without skin cancer in the high exposure group:

150 / 615 ≈ 0.2439
5. Multiply the incidence rate by 100 to express it as a percentage:

0.2439 * 100 = 24.39%.

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The total possible outcomes are 36 and the probability of rolling a 5 and a 6 is 1/36 = 0.028

The likelihood that a specific occurrence will occur.

The proportion of the total number of possible outcomes to the number of outcomes in an exhaustive set of equally probable outcomes that result in a particular event.

Two six-sided dice are rolled there are 36 possibilities for outcomes which means 6 possibilities for the first dice and 6 for the second dice.

Therefore 36 is the total possibility outcome.

Count the number of outcomes for the one dice show 5 and the second dice show 6.

There is only one possibility two show the (5, 6) from the total s3 outcomes.

so the probability of rolling a 5 and a 6 i = 1/36 or about 0.028.

Therefore, the total possible outcomes are 36 and the probability of rolling a 5 and a 6 is 1/36.

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Answer:

8 = 83°

Step-by-step explanation:

4 = 2 (Vertically opp. angles)

2 = 8 (Alternate interior angles)

Therefore 4 = 8

Since 4 = 83°

8 = 83°

Answer:

<8 = 83 degrees

Step-by-step explanation:

<4 and <8  are corresponding angles and corresponding angles are equal if lines are parallel

<4 = 83 so <8 = 83

The deviation of a measurement from the true value, while uncertainty quantifies the reliability of the measurement.

Systematic uncertainty can be estimated for a measured value by identifying and evaluating factors that may cause a consistent deviation in the measurements. These factors may include instrument calibration errors, environmental conditions, or personal bias. To estimate systematic uncertainty, follow these steps:
1. Identify potential sources of systematic error.
2. Quantify the magnitude of each error source.
3. Combine these errors, typically by adding them in quadrature (square root of the sum of squares).
Random uncertainty, on the other hand, arises from unpredictable variations in the measurement process. It can be estimated by performing multiple measurements and analyzing the data. The steps to estimate random uncertainty are:
1. Perform multiple measurements of the same quantity.
2. Calculate the mean (average) of the measurements.
3. Calculate the standard deviation, which represents the spread of the data around the mean.
The difference between error and uncertainty lies in their definitions and how they affect measurements. Error is the difference between the measured value and the true value of a quantity. It can be classified as systematic (consistent and predictable) or random (unpredictable and variable). Uncertainty, however, represents the level of confidence with which the measured value is known, considering the limitations of the measuring process. It is often expressed as a range or interval and encompasses both systematic and random uncertainties. In summary, error is the deviation of a measurement from the true value, while uncertainty quantifies the reliability of the measurement.

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The logarithmic function y = log(4x-a) is positive for all values of x which are greater than a/4.

A function of this type is a logarithmic function. which can be interpreted as "y equals the log, base b, of x" or "y equals the log of x, base b."

Finding the domain of x that makes the argument (4x-a) of the logarithm positive will help us identify the values of x for which the logarithm in the equation y = log(4x-a) is positive.

Remember that a positive number's logarithm is positive and a negative number's logarithm is indeterminate. (in the real number system).

We must therefore identify the x values that meet the inequality:

4x - a > 0

4x > a

x >a/4

After finding x, we obtain:

x > a/4

The equation y = log(4x-a) therefore has the following domain of x for which the logarithm is positive:

In other words, for all values of x larger than a/4, the expression y = log(4x-a) is defined and positive.

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Answer:

about 7 days

Step-by-step explanation:

31 · .22

6.82 days

rounded up it would be approximately  7 days

79 hours will it take for one person to harvest the entire strawberry patch.

The same property is expressed using a unit conversion but in a distinct unit of measurement. For instance, time can be stated in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other length unit instead of miles.

Finding the strawberry patch's area in square meters and dividing it by the amount that one person can harvest in an hour will give us the total number of hours needed to solve this issue.

The strawberry patch's measurements must first be changed from decameters (dam) to meters.

1 decameter (dam) = 10 meter

Strawberry patch length in meters = 1.7 dam * 10 m/dam = 17 m.

The strawberry patch width in meters = 1.4 dam x 10 m/dam = 14 m.

The strawberry patch's area is therefore:

Area of strawberry patch = length × width = 17 m × 14 m = 238 m²

We must now determine how long it will take one individual to pick 3 m² of strawberries, in hours. We can calculate this by dividing the patch's overall area by the area that a single individual can select in an hour:

[tex]\frac{Area of strawberry patch}{ Area picked per hour }[/tex] = a number of hours needed to harvest the complete patch.

The total harvesting time is [tex]\frac{238 m2 }{3 m2/hour}[/tex] = 79.33 hours nearly equal to 79

Therefore, it would take one person 79 hours to gather the complete strawberry patch.

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The result is negative, meaning there is insufficient material to make the curtains without seams.

Each curtain requires 2 1/5 meters of material, so for 8 curtains, the total amount of material required is:

8 x 2 1/5 = 17 3/5 meters

However, Mason's mother only has 16 1/4 meters of material, so she needs to buy more material. The amount of additional material needed is the difference between what she has and what she needs:

17 3/5 - 16 1/4 = 1 2/5 meters

Therefore, Mason needs to buy 1 2/5 meters of material.

To determine how much material is left over, we need to subtract the total amount of material needed for the curtains from the amount of material Mason's mother has:

16 1/4 - 17 3/5 = -1 3/20

In this case, Mason's mother would need to either buy more material or adjust the dimensions of the curtains to fit the amount of material she has.

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Answer:

3200

Step-by-step explanation:

If we know the fact that :
1GB = 1000MB
We can form an equation to show that 16000MB divided by 5MB should give you your answer.
The answer you get is 3200.
This means that you can fit 3200 5 MB files into a 16GB flash drive.
Hoped this helped,
thank you

Answer:

Step-by-step explanation:

You want the value of x and the length of side WA in rhombus WART with sides marked 7x-22 and 3x+10.

The sides of a rhombus are congruent, so ...

  7x -22 = 3x +10

  4x = 32 . . . . . . . . add 22-3x

  x = 8

  3x+10 = 3·8 +10 = 34

The value of x is 8, and side WA is 34 units.

The value of A is 9/10.

What is binomial?

Binοmial refers tο a type οf prοbability distributiοn that describes the number οf successes in a fixed number οf independent trials, where each trial has οnly twο pοssible οutcοmes (success οr failure) and the prοbability οf success is cοnstant acrοss all trials.

The given expressiοn is the sum οf the first several terms οf a harmοnic series. Tο evaluate it, we can use the fοrmula fοr the sum οf the first n terms οf a harmοnic series:

1 + 1/2 + 1/3 + ... + 1/n = ln(n) + γ,

where ln(n) is the natural lοgarithm οf n and γ is the Euler-Mascherοni cοnstant (apprοximately 0.5772).

Using this fοrmula, we can write the expressiοn as:

A = 1/3 + 1/6 + 1/10 + 1/15 + ... + 1/45

= (1/1 - 1/2) + (1/2 - 1/3) + (1/3 - 1/4) + ... + (1/9 - 1/10)

= 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/9 - 1/10

= 1 - 1/10

= 9/10

Therefore, the value of A is 9/10.

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Complete Question:

Find The value of A

A=1\3+1\6+1\10+1\15+...+1\45

The probability is unlikely.

What is probability ?

A probability is a number that expresses the possibility or liability that a specific event will take place. Chances can be stated as proportions with a range of 0 to 1, or as probabilities with a range of 0 to 100.

                              Probability is a measure of how likely or likely-possible commodity is to be. For case, there's only one system to admit a head and there are a aggregate of two possible issues, hence the chance of flipping a coin and entering heads is 1 in 2.( a head or tail). P( heads) = 12 is what we write.

The value of the probability and the notation is given as

P(true) = 0.2

As a general rule of probability, we have

Range of probability value = 0 to 1 (inclusive)

Unlikely = less than 0.5

Equally likely and unlikely = 0.5

Likely = greater than 0.5

Using the above as a guide, we have the following:

The value of P(true) = 0.2 is less than 0.5

This that the probability is unlikely.

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The value of the expression 9 + (20 x one-fourth) – 6 ÷ 2  is 11.

What is PEMDAS?

PEMDAS stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right). It is a mnemonic or acronym used to remember the order of operations when simplifying mathematical expressions.

Using PEMDAS (Order of Operations), we perform the operations in the following order:

Parentheses

Exponents

Multiplication and Division (from left to right)

Addition and Subtraction (from left to right)

Applying this to the given expression:

9 + (20 x one-fourth) – 6 ÷ 2

= 9 + (20 x 0.25) - 3 [simplify division first: 6 ÷ 2 = 3]

= 9 + 5 - 3 [simplify multiplication: 20 x 0.25 = 5]

= 11 [simplify addition and subtraction from left to right]

Therefore, the value of the expression is 11.

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The expressions that are equivalent to 4√5 is

A) 2√20

C) [tex]3\sqrt5+\sqrt5[/tex]

D) [tex]4\times 5^{1/2}[/tex]

Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation. Unknown variables, integers, and arithmetic operators are the components of an algebraic expression. There are no symbols for equality or inequality in it.

Here the given expression is [tex]4\sqrt5[/tex].

Now simplifying the given option expressions then,

A) [tex]2\sqrt{20}[/tex] = [tex]2\sqrt{4\times5}[/tex]

= [tex]2\times2\sqrt{5}[/tex]

= [tex]4\sqrt5[/tex]

B) [tex]6^{1/2}-5^{1/2}[/tex]

[tex]= \sqrt6-\sqrt5[/tex]

C) [tex]3\sqrt5+\sqrt5[/tex]

= [tex]4\sqrt5[/tex]

D) [tex]4\times 5^{1/2}[/tex]

[tex]= 4\sqrt5[/tex]

E) [tex]2\sqrt{10}[/tex]

F) [tex]3\times5^{1/2}[/tex]

[tex]=3\sqrt5[/tex]

Hence  the expressions that are equivalent to 4√5 is

A) 2√20

C) [tex]3\sqrt5+\sqrt5[/tex]

D) [tex]4\times 5^{1/2}[/tex]

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To find the inverse of the function y = x² + 4x + 4, we first replace y with x and x with y:

x = y² + 4y + 4

Next, we rearrange the equation to isolate y on one side of the equation:

x - 4 = y² + 4y

y² + 4y = x - 4

Now, we complete the square by adding (4/2)² = 4 to both sides of the equation:

y² + 4y + 4 = x

We can rewrite the left side of the equation as (y + 2)²:

(y + 2)² = x

Finally, we take the square root of both sides of the equation and solve for y:

y + 2 = ±√x

y = ±√x - 2

Since the original function is not one-to-one, we need to restrict the domain to obtain the inverse function. Specifically, we restrict the domain of the original function to x ≥ -2, since for values of x less than -2 there are two corresponding y-values. Therefore, the inverse function of y = x² + 4x + 4 for this restricted domain is:

y = ±√x - 2, x ≥ -2

Yes, Briony has enough material. She needs 18m of material, which is less than the 19m she has.

To find length of material, we need to calculate the length of each

curtain piece using the given length of material.

To convert a mixed number to an improper fraction, multiply the

denominator (the bottom number) by the whole number, and add the

numerator (the top number).

Now, to convert 2 1/4m into an improper fraction, we multiply the

denominator (4) by the whole number (2), then add the numerator (1).

This gives us (2 × 4) + 1 = 9.

Hence, 2 1/4m can be written as 9/4m.

Since Briony needs 8 pieces of curtain material 2 1/4m in length, she will need a total of:

8 × 2 1/4m = 8 × 9/4m = 18 1/4m.

Briony requires 18 1/4m of curtain material. Since she has 19 m length of

material, she has enough to create 8 pieces of curtain material of 2 1/4m

in length.

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Step-by-step explanation:

To find the percentage of a fraction you divide the top by the bottom and multiply by 100. So 3/4 = 0.75 then 0.75 x 100 = 75%. Now you need to find 3/4ths or 75 percent of 200. An easy way to do this is find 1/4 of 200. So 200/4 = 50. Now you need 3/4 of 200, not just one fourth so multiply 50 by 3 to get 150. The class has made 150 cranes.

3 dm is equal to 300 mm, 5 dm is equal to 500 mm, and 2 dm is equal to 200 mm.

To convert 3 dm to mm, we multiply by 10 to get 30 cm, and then by another 10 to get 300 mm.

To convert 5 dm to mm, we multiply by 10 to get 50 cm, and then by another 10 to get 500 mm.

To convert 2 dm to mm, we multiply by 10 to get 20 cm, and then by another 10 to get 200 mm.

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Answer: 39

Step-by-step explanation:

x = (56/100) * y

where x is the amount we're trying to find and y is the total amount.

We're given that 56% of this value is $21.84, so we can substitute these values into the equation:

21.84 = (56/100) * y

To solve for y, we can divide both sides by 56/100:

y = 21.84 / (56/100)

Simplifying this expression, we get:

y = 39

Therefore, the number that represents 56% of this value is $21.84.

Answer:

30%

Step-by-step explanation:

(156-120) / 120 × 100％

=36 / 120 × 100％

=30%

Answer: 7>x< 10

Step-by-step explanation:

Thus, the perimeter of the regular nonagon with centre O is found as: 78.57 units.

A closed, 2D structure with a finite number of line segments is referred to as a polygon. A polygon's number of vertices and its number of line segments are always identical. The perimeter of a closed figure is the sum of the lengths of its outermost sides. It is the sum of the lengths of a polygon's sides.

P = (Side length) x n

The apothem of each of the 9 isosceles triangles that make up the regular nonagon is 12 cm.

The angle at the circle's centre is 360/9 = 40º.

Hence, the sides of the regular nonagon, if the apothem of a isosceles triangles is 12 cm.

2*12 tan (40/2) = 8.73 cm

Then the perimeter:

P = 9 x 8.73

P = 78.57 units

Thus, the perimeter of the regular nonagon with centre O is found as: 78.57 units.

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Answer:

5, 30, 180, 1080, 6480, 38880, 233280

The pattern is times 6.

Step-by-step explanation:

You're welcome.