What is the equation of parabola with focus (4,5) and a directrix y =-1

The least biased sampling strategy is D) Go through the company’s customer records, selecting every 40th subscriber. Send employees to those homes to interview the people chosen.

Four new sampling strategies have been proposed to help PTV determine whether enough cable subscribers are likely to purchase high-speed Internet Service. For each, indicate what kind of sampling strategy is involved and what (if any) biases might result.A) Run a poll on the local TV news, asking people to dial one of two phone numbers to indicate whether they would be interested. This type of sampling strategy is known as convenience sampling.

This technique is biased since only those who watch the local TV news and are interested in high-speed internet services can participate in the survey. The majority of the consumers who are in need of high-speed internet may not watch the local TV news. Hence the survey is biased and does not represent the entire population.B) Hold a meeting in each of the fifteen towns and tally the opinions expressed by those who attend the meetings. This type of sampling strategy is called a Quota sampling. It is biased since there is no guarantee that everyone will attend the meeting or that they will represent the opinions of the entire population.

This sampling strategy also has a higher risk of selection bias since the people who are likely to attend the meeting are the ones who are interested in the product.C) Randomly select one street in each town and contact each of the households on that street. This type of sampling strategy is called Cluster Sampling. This method is less biased compared to the other two strategies mentioned earlier. Since each street is chosen at random, there is a higher chance of getting opinions from a wider range of customers. However, this strategy can still be biased as the opinions may differ from one street to another.D) Go through the company’s customer records, selecting every 40th subscriber. Send employees to those homes to interview the people chosen. This type of sampling strategy is called Systematic Sampling.

This strategy is the least biased among the four strategies. Since customers are selected randomly, there is a higher chance of obtaining a representative sample. The opinions of customers who have discontinued the services are not included, and the survey can only be conducted with current customers. 

Hence, the least biased sampling strategy is D) Go through the company’s customer records, selecting every 40th subscriber. Send employees to those homes to interview the people chosen.

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The statement required to complete the proof is

            Statement                                        Reason

6 ∠ CDB and ∠ BDE are supplementary    If two angles form a linear pair,

                                                                      then they are supplementary

In geometry, a linear pair is a pair of adjacent angles formed by two intersecting lines. The angles in a linear pair are always supplementary, which means they add up to 180 degrees.

According to the proof,  

line 2 of the proof have it that ∠ BDE = ∠ BED

hence we say that ∠ CDB is congruent to ∠ AEB since they are supplementary to same angle

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The column headings of a check register and the information that go in that location are:

A check register, also known as a cash disbursements journal, is where you record all of your company's check and cash transactions during an accounting period. A check register is used by businesses to calculate the running balance of their checking account.

A check register will usually show the checking account's running balance. It functions similarly to a real-time record of the bank account. The bookkeeper can ensure that the total bank balance and the check register are in sync.

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As per the unitary method, the amount saved by Aaron after one year is  $780

We can use the following formula to find out how much Aaron saves per month:

Amount saved per month = Total amount saved / Number of months

We can use this formula to find out how much Aaron saves per month for each period:

For the first period (3 months):

Amount saved per month = 195 / 3

= 65

For the second period (4 months):

Amount saved per month = 260 / 4

= 65

For the third period (6 months):

Amount saved per month = 390 / 6

= 65

For the fourth period (7 months):

Amount saved per month = 455 / 7

= 65

We can see that Aaron saves $65 per month, regardless of the time period. Therefore, we can use this value to find out how much he will save in one year (12 months):

Amount saved in 1 year = Amount saved per month x Number of months

= 65 x 12

= 780

Therefore, we can predict that Aaron will save $780 after one year.

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The length of the rectangle is 10 inches and the rectangle is 10 inches long and 2 inches wide.

The total distance around the outside of the rectangle is termed as Perimeter of a rectangle. It is equal to the sum of the lengths of all four sides of the rectangle.

Let's assume that the width as "w" inches.

As per the problem statement, the length of the rectangle is 5 times its width, which means that the length is 5w inches.

The perimeter of a rectangle is :

P = 2(l + w)

Substituting the values, we get:

24 = 2(5w + w)

Simplifying the above equation, we get:

24 = 12w

Dividing both sides by 12, we get:

w = 2

So, the width of the rectangle is 2 inches.

The length is 5 times of width, that is:-

l = 5w = 5(2) = 10

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[tex]\huge\text{Hey there!}[/tex]

[tex]\mathtt{5x + 2 = 3}[/tex]

[tex]\large\textsf{SUBTRACT 2 to BOTH SIDES}[/tex]

[tex]\mathtt{5x + 2 - 2 = 3 - 2}[/tex]

[tex]\large\textsf{SIMPLIFY it}[/tex]

[tex]\mathtt{5x = 3 - 2}[/tex]

[tex]\mathtt{5x = 1}[/tex]

[tex]\large\textsf{DIVIDE 5 to BOTH SIDES}[/tex]

[tex]\mathtt{\dfrac{5x}{5} = \dfrac{1}{5}}[/tex]

[tex]\large\textsf{SIMPLIFY it}[/tex]

[tex]\mathtt{x = \dfrac{1}{5}}[/tex]

[tex]\huge\text{Therefore your answer should be:}[/tex]

[tex]\huge\boxed{\mathtt{x = \dfrac{1}{5}}}}\huge\checkmark[/tex]

[tex]\huge\text{Good luck on your assignment \& enjoy your day!}[/tex]

The directional angles of [tex]\vec u[/tex] are approximately 101.14° with respect to the x-axis, 164.08° with respect to the y-axis, and 82.46° with respect to the z-axis.

To find the directional angles of  [tex]\vec u[/tex] , we can use the following formula:

[tex]cos\theta = u_i / |u|[/tex]

where θ is the angle between the vector and the positive x, y, or z-axis, [tex]u_i[/tex]  is the x, y, or z-component of the vector, and |u| is the magnitude of the vector.

First, we can calculate the magnitude of [tex]\vec u[/tex]  as:

[tex]|u| = \sqrt{((-8)^2 + (-40)^2 + 7^2)} = \sqrt{(1749)[/tex]

Next, we can calculate the directional angles as:

[tex]cos\theta x = -8 / \sqrt{(1749)[/tex] ≈ [tex]-0.1939[/tex]

θx ≈ 101.14°

[tex]cos\theta y = -40 / \sqrt{(1749)[/tex] ≈ -0.9679

θy ≈ 164.08°

[tex]cos\theta z = 7 / \sqrt{(1749)[/tex] ≈ 0.1441

θz ≈ 82.46°

Therefore, the directional angles of [tex]\vec u[/tex] are approximately 101.14° with respect to the x-axis, 164.08° with respect to the y-axis, and 82.46° with respect to the z-axis.

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The complete question is :

Let [tex]\vec{u}= -8i -40j + 7k[/tex] be a vector in space. Calculate and give the directional angles of u in degrees.

Carrying an ax in one's teeth is a dangerous and potentially deadly action.

The weight and sharpness of the ax could easily cause injury or even death if it were to slip or the individual were to lose their balance.

Additionally, carrying an ax in this manner would likely result in the person being unable to communicate effectively, as their mouth would be occupied and their ability to speak clearly would be hindered.

If someone were to attempt to carry an ax in their teeth, they would be risking their safety and potentially the safety of those around them.

It is not a recommended or advisable course of action, and anyone who witnessed such behavior should exercise caution and avoid interacting with the individual until the ax has been safely secured.

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the probability of the numbers will add to 4 or less will be 25%

What is the percentage?

A percentage that represents a tenth of a quantity. One percent, denoted by the symbol 1%, is equal to one-hundredth of something; hence, 100 percent denotes the full thing, and 200 percent designates twice the amount specified. A portion per hundred is what the percentage denotes. The percentage refers to one in a hundred. The % sign is used to denote it.

The orange spinner is spun and then the aqua spinner is spun.

The probability that the numbers will add to 4 or less will be of 1 out of 4 that will be 1/4*100

= 25%

Hence the probability of the numbers will add to 4 or less will be 25%

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For the graph given for function |x-1|, the relation is one - to - one.

What is a relation?

In mathematics, a relation describes the connection between two distinct collections of data. If more than two non-empty sets are taken into consideration, the relationship between them will be determined if there is a connection between their components.

The graph given is a graph of function |x-1|.

The graph of |x-1| is a V-shaped graph, with the vertex at (1, 0) and the arms extending upward and downward from the vertex.

Since the graph of |x-1| passes the horizontal line test, it is a one-to-one function.

This means that every input (x-value) has a unique output (y-value) and no two different inputs can have the same output.

Therefore, the relation represented by the graph of |x-1| is a one-to-one relation.

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From the diagram, the value of x to the nearest tenth is given as 8cm

We should be aware that Trigonometry ratio is the relationship between the measurement of lengths and angles of a right triangle

The given triangle is a right angle triangle having the following:

Opposite = x

Adjacent = 12 cm and

Angle proportional to x = 35⁰

Using the trigonometrical ratio of Tangent

Tan∅ = opposite/adjacent

Tan35⁰ = x/12

Cross and multiply to have

x= 12*tan35⁰

x= 12*0.7002

The value of x is given by 8.402490459

Therefore the value to the nearest tenth is 8 cm

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Answer:

C. Since the amount added per unit time is constant, the amount of water in the bucket increases by a constant amount for equal time intervals. This is a linear function.

B. The interest paid each year is constant, so the amount earned increases by a constant amount for equal time intervals. This is a linear function.

B. The interest paid each month is a factor of the current balance, so the balance is multiplied by a constant factor for equal time intervals. This is an exponential function.

Step-by-step explanation:

Answer: Your welcome!

Step-by-step explanation:

1. Answer: D. Since the amount added per unit time is constant, the amount of water in the bucket is multiplied by a constant factor for equal time intervals. This is an exponential function. As time increases, the amount of water in the bucket will increase exponentially (each successive unit of time will add a multiple of the original amount).

2. A. The amount earned is described by a linear function. The interest paid each year is constant, so the amount earned increases by a constant amount for equal time intervals. This is a linear function.

3. Answer: B. The interest paid each month is a factor of the current balance, so the balance is multiplied by a constant factor for equal time intervals. This is an exponential function.

An exponential function is one in which the value of a variable increases or decreases by a constant factor for each equal time interval. In this case, the balance of the savings account increases by a fixed amount of interest each month, which is calculated from the current balance. This amount is multiplied by the current balance, resulting in an exponential function.

Answer:

Assuming an ideal pulley system, the force required to lift a 10 Newton box with one pulley would be 10 Newtons. This is because the force required to lift an object using a pulley system is equal to the weight of the object being lifted. In an ideal pulley system, there is no friction or energy loss, so the force required is equal to the weight of the object. Therefore, if the weight of the box is 10 Newtons, a force of 10 Newtons would be required to lift it with one pulley.

The semicircle's radius is roughly 1.38 cm, and its perimeter is roughly 5.37 cm.

the perimeter of the semicircle is:

P = l + C(semi)

P = r + πr

P = (1 + π)r

P ≈ 5.37 cm

The area encircling a two-dimensional figure is known as its perimeter. Whether it is a triangle, square, rectangle, or circle, it specifies the length of the shape. The two primary characteristics of a 2D shape are area and perimeter.

Each form has a different perimeter depending on its measurements. The perimeter is only ever stated as the circle's diameter when referring to a circle. So we must add all of the sides of each polygon to determine its perimeter, which is the same for all polygons.

from the question:

Let's start with finding the radius of the semicircle.

The formula for the area of a semicircle is:

A = (πr²)/2,

where A is the area and r is the radius.

We are informed that the semicircle's area is 6 [tex]cm^2[/tex]. So, we can enter this value into the formula and find r:

6 = (πr²)/2

Multiplying both sides by 2:

12 = πr²

Dividing both sides by π:

r² = 12/π

Taking the square root of both sides:

r = √(12/π)

Now we can simplify this expression by rationalizing the denominator:

r = √(12/π) * (√π/√π)

r = √(12π)/π

r ≈ 1.38 cm

Thus, the semicircle's radius is roughly 1.38 cm.

We must multiply the circumference of the semicircle by the length of the straight edge to determine the semicircle's perimeter. The formula for calculating a circle's circumference is:

C = 2πr

But for a semicircle, we only need half of the circumference:

C(semi) = πr

So the perimeter of the semicircle is:

P = l + C(semi)

P = r + πr

P = (1 + π)r

P ≈ 5.37 cm

As a result, the semicircle's radius is roughly 1.38 cm, and its perimeter is roughly 5.37 cm.

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Answer:

8)  x = 5, y = -5

10)  x = -2.8, y = 3.4

Step-by-step explanation:

To solve a system of linear equations we can use either the substitution method or the elimination method.

Given system of linear equations:

[tex]\begin{cases}-6x-3y=-15\\6y+6x=0\end{cases}[/tex]

Solve the given system of linear equations using the elimination method.

Add the two equations to eliminate the term in x:

[tex]\begin{array}{crcccl}&-6x & - & 3y & = & -15\\+&(6x & + &6y & = & \;\;\;\;0)\\\cline{2-6}&0&+&3y&=&-15\end{array}[/tex]

Solve the resulting equation for y by dividing both sides by 3:

[tex]\implies 3y \div 3 &=-15 \div 3[/tex]

[tex]\implies y=-5[/tex]

Substitute the found value of y into the second equation and solve for x:

[tex]\implies 6(-5)+6x=0[/tex]

[tex]\implies -30+6x=0[/tex]

[tex]\implies 6x=30[/tex]

[tex]\implies 6x \div 6=30 \div 6[/tex]

[tex]\implies x=5[/tex]

Therefore, the solution to the given system of equations is:

[tex]\begin{cases}-x+3y=13\\-3x-y=5\end{cases}[/tex]

Solve the given system of linear equations using the substitution method.

Rearrange the first equation to isolate x:

[tex]\implies -x+3y=13[/tex]

[tex]\implies 3y=x+13[/tex]

[tex]\implies x=3y-13[/tex]

Substitute the expression for x into the second equation and solve for y:

[tex]\implies -3(3y-13)-y=5[/tex]

[tex]\implies -9y+39-y=5[/tex]

[tex]\implies -10y+39=5[/tex]

[tex]\implies -10y=-34[/tex]

[tex]\implies -10y\div -10=-34 \div -10[/tex]

[tex]\implies y=3.4[/tex]

Substitute the found value of y into the expression for x and solve for x:

[tex]\implies x=3(3.4)-13[/tex]

[tex]\implies x=10.2-13[/tex]

[tex]\implies x=-2.8[/tex]

Therefore, the solution to the given system of equations is:

The cοrrect sample space fοr the gumballs in her bag is, Sample space = watermelοn, lemοn-lime, lemοn-lime, grape, grape, grape

A sample space is a set οr cοllectiοn οf pοtential οutcοmes frοm a randοm experiment. The letter "S" stands fοr the sample space in a symbοl. The term "events" refers tο a subset οf pοssible experiment results. Depending οn the experiment, a sample space may cοntain variοus οutcοmes. It is referred tο as discrete οr finite sample spaces if there are a finite number οf pοssible οutcοmes.

The sample space is the set οf all pοssible οutcοmes οf an experiment. In this case, the experiment is selecting a gumball frοm Julia's bag, and the pοssible οutcοmes are watermelοn, lemοn-lime, and grape.

Sο the cοrrect sample space fοr the gumballs in her bag is:

Sample space = {watermelοn, lemοn-lime, grape, grape, lemοn-lime, grape}

Therefοre, the cοrrect οptiοn is A.

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Solution is in da attachment!! :D

The data collected on the daily volumes of water consumed by rabbits in the sample is most likely positively skewed, given the mode of 19, the median of 17, and u = 14.

Positive skewness occurs when there are more data points on the right side of the mean than on the left side, resulting in a “tail” that is skewed to the right side.

In this case, the mode of 19 is greater than the median of 17, which is greater than u of 14, indicating that there are more data points on the right side of the mean than on the left side. This means that the data is likely positively skewed.

It is important to note that the data cannot be negatively skewed, symmetrical, or bimodal based on the information given. Negative skewness occurs when there are more data points on the left side of the mean than on the right side, which is not the case here.

Symmetrical data is when the mean, median, and mode are all the same, which is not the case here.

Bimodal data is when there are two distinct modes, which is not the case here either.

Given the information, the data collected of the daily volumes of water consumed by the rabbits in the sample is most likely positively skewed.

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Answer:

The area of a circle can be calculated using the formula:

Area = π x radius^2

where π (pi) is a mathematical constant approximately equal to 3.14159.

Since each rug has a radius of 4 feet, the area of one rug is:

Area = π x 4^2

Area = 16π square feet

To find the total area covered by the three rugs, we need to multiply the area of one rug by three:

Total area = 16π square feet x 3

Total area = 48π square feet

Using a calculator, we can approximate the value of π to two decimal places as 3.14, so the total area covered by the three rugs is:

Total area ≈ 48 x 3.14 square feet

Total area ≈ 150.72 square feet

Therefore, Joanna's bedroom floor will be covered by approximately 150.72 square feet of rugs.

Answer:

The true statements are:

Step-by-step explanation:

The general equation of a circle is:

[tex]\boxed{(x - h)^2 + (y - k)^2 = r^2}[/tex]

where:

To rewrite the given equation x² + y² - 2x - 8 = 0 in standard form, begin by moving the constant to the right side of the equation and collect like terms on the left side of the equation:

[tex]\implies x^2-2x+y^2=8[/tex]

Add the square of half the coefficient of the term in x to both sides of the equation. (As there is no term in y, we do not need to add the square of half the coefficient of the term in y):

[tex]\implies x^2-2x+\left(\dfrac{-2}{2}\right)^2+y^2=8+\left(\dfrac{-2}{2}\right)^2[/tex]

Simplify:

[tex]\implies x^2-2x+1+y^2=9[/tex]

Factor the perfect square trinomial in x:

[tex]\implies (x-1)^2+y^2=9[/tex]

We have now written the equation in standard form.

Comparing this with the standard form equation, we can say that:

Therefore, the center of the circle (h, k) is (1, 0) and its radius is 3 units.

As the y-coordinate of the center is zero, the center lies on the x-axis.

Therefore, the true statements are:

Answer:

the answer is t/(n-m)

Step-by-step explanation:

a(n-m)=t

divide both sides by (n-m) to make a the subject of formula

a(n-m)/(n-m)=t/n-m)

a=t/(n-m)

a.F=kx is the formula that expresses F as a function of x

b. k=F/x=8/0.3=26.67.

c.72.01 lbs

Hooke's law is a principle of physics that describes the elasticity of springs when stretched or compressed. The amount of stretch or compression of the spring is directly proportional to the force applied, according to the law.What is Hooke's Law and how can you express F as a function of x?Hooke's law is a principle of physics that describes the elasticity of springs when stretched or compressed. The amount of stretch or compression of the spring is directly proportional to the force applied, according to the law. F=kx is the formula that expresses F as a function of x using the constant of proportionality k.What is the value of k in part (a)?It is given that F=kx, and that the weight of 8 pounds stretches a spring from its natural length of 10.4 inches to a length of 10.7 inches. We have to find the value of k.8 pounds, according to Hooke's law, stretches the spring 10.7-10.4=0.3 inches from its natural length.Using F=kx, we can say that the force applied is 8 pounds, or F=8. Therefore, we have k=F/x=8/0.3=26.67.What weight will stretch the spring in part (b) to a length of 13.1 inches?We are given that the spring stretches from its natural length of 10.4 inches to a length of 13.1 inches. To find the force required to produce this extension, we need to subtract the natural length from the final length, as we did before.13.1-10.4=2.7 inches is the distance by which the spring will be stretched.The formula for F is still F=kx, and we know the value of k, which is 26.67. Thus, F=26.67*2.7=72.01 lbs.

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Answer:

[tex]\frac{24}{5}[/tex]

Answer:

It's true - all whole numbers that are odd are going to add up to an even integer. An odd integer can be looked at as an even number plus one. For example, 21 would be 20 (the even number) plus one. So the addition of two odd integers is like saying two even numbers were added to each other (in that example, 20 + 20), and then adding the 1+1 that made them odd (which adds up to 2, an even number). So it would be [20 + 20 + (1 + 1)]

When answering questions on Brainly, you should always be factually accurate, professional, and friendly, be concise and do not provide extraneous amounts of detail, provide a step-by-step explanation in your answer, and use the following terms in your answer, "statistic", "X=175 and s=22", "standard deviation".Part a)Hypothesis: H0: μ=20, H1: μ≠20The sample size n=25Given that α=0.05σ=5The X (sample mean) is 21.The test statistic is given by,\[Z = \frac{{\bar X - \mu }}{{\frac{\sigma }{{\sqrt n }}}} = \frac{{21 - 20}}{{\frac{5}{{\sqrt {25} }}}} = 2\]The rejection region is obtained by finding the Z value that will cut off 2.5% of the area in each tail of the standard normal distribution curve at 0.025.The rejection region is Z< -1.96 and Z > +1.96.Interpretation: Since the calculated Z value 2 lies outside the rejection region, reject the null hypothesis H0 and conclude that there is sufficient evidence to support the alternative hypothesis H1.Part b)Given,Sample size n=200, X=175 and s=22Null hypothesis H0: µ=180Alternative hypothesis H1: µ ≠ 180.Level of significance α=0.05i) The test statistic is given by,\[Z = \frac{{\bar X - \mu }}{{\frac{\sigma }{{\sqrt n }}}} = \frac{{175 - 180}}{{\frac{22}{{\sqrt {200} }}}} = - 5.68\]ii) Since the calculated Z value (-5.68) is less than -1.96, it falls in the rejection region. Reject the null hypothesis H0 and conclude that there is enough evidence to infer at the 5% significance level that the population mean is different from 180.When the population standard deviation is 22, the test statistic is,\[Z = \frac{{\bar X - \mu }}{{\frac{\sigma }{{\sqrt n }}}} = \frac{{175 - 180}}{{\frac{22}{{\sqrt {200} }}}} = - 3.37\]Since the calculated Z value (-3.37) is less than -1.96, it falls in the rejection region. Reject the null hypothesis H0 and conclude that there is enough evidence to infer at the 5% significance level that the population mean is different from 180.

Answer:

(2,1)

Step-by-step explanation:

80  unit²  is the area of the polygon in square units .

What do you mean by polygon?

A polygon is a closed object in a two-dimensional plane comprised of line segments rather than curves. The word "polygon" is a combination of the words "poly" (which meaning many) and "gon" (means sides). In order to create a closed figure, at least three line segments must be connected end to end.

The area of the polygon is required.

The area of the polygon is D. 80 square units

For triangle BCD

b = Base = 4-2 = 2 units

h = Height = 4 units

Area

    1/2bh

 = 1/2 * 2 * 4

= 4 unit²

For triangle DEF

b = Base = 2-(-1) = 3 units

h = Height = 4 units

Area

   1/2bh

= 1/2 * 3 * 4

=  6 unit²

For trapezoid ABFG

a = 4-(-1) = 5.5 units

b = 4-(-8) = 12 units

h = 8 units

Area

 1/2(a + b)h

= 1/2(5.5 + 12) * 8

 = 70 unit²

Total area is

 4 + 6 + 70  = 80  unit²

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BODMAS rule, helps us to determine the value of expression. The expanded value of expression,

63 - [(- 3){- 2 - 8 - 3}] ÷ [3{5 + (- 2)(- 1)}], is equals to the 61.14.

Mathematical operations such as addition, subtraction, multiplication, and division are included in arithmetic operations. For solving expression according to specific priority, we use the BODMAS rule, which follows as

Now, we have an expression, 63 - [(- 3){- 2 - 8 - 3}] ÷ [3{5 + (- 2)(- 1)}] say x

=> x = 63 - [(- 3){- 2 - 8 - 3}] ÷ [3{5 + (- 2)(- 1)}]

we have to calculate value of x,

Using BODMAS rule,

=> x = 63 - [(- 3){- 13 }] ÷ [3{5 + 2}] (expands inner bracket)

=> x = 63 - [ 39 ] ÷ [3×7]

=> x = 63 - [ 39 ÷ 21]

=> x = 63/1 - 13/7

Taking least common multiple, (1,7) = 7

=> x = ( 63×7 - 13)/7

=> x = (441 - 13)/7 = 428/7

=> x = 61.14

Hence, value of expression is 61.14.

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