The petrol consumption of a van, in litres per 100 kilometres, is given by the formula
Petrol consumption=100×litres of petrol used/kilometres travelled
Imran used his van to travel 250 kilometres,correct to 3 significant figures
The van used 21.3 litres of petrol, correct to 3 significant figures
Imran says, "My van used less than 8.5 litres of petrol per 100 kilometres."
Could Imran be wrong Yes/No

There is enough evidence to show that the mean carbon dioxide emission is now lower than it was in 2004.

To test whether the mean carbon dioxide emission is now lower than it was in 2004, we need to conduct a one-sample t-test.

We are given a random sample of carbon dioxide emissions from a recent study. Let's assume that this sample is representative of the population of interest. The null hypothesis is that the true population mean of carbon dioxide emissions is equal to or greater than the mean in 2004 (4.87 metric tons per capita). The alternative hypothesis is that the true population mean is less than the mean in 2004.

We can set up the hypotheses as follows:

H0: μ >= 4.87

Ha: μ < 4.87

where μ is the true population mean of carbon dioxide emissions.

We are given the sample data in a table, but we don't know the population standard deviation, so we will use the sample standard deviation to estimate it. The sample mean is calculated as:

x = (4.28 + 3.94 + 3.27 + 3.81 + 3.43 + 3.09 + 2.52 + 2.98 + 3.23 + 3.36) / 10 = 3.43

The sample standard deviation is calculated as:

s = √(((4.28 -x)² + (3.94 - x)² + ... + (3.36 - x)²) / 9) = 0.659

The sample size is n = 10.

We can calculate the t-statistic as:

t = (x- μ) / (s / √(n)) = (3.43 - 4.87) / (0.659 / √(10)) = -4.26

The degrees of freedom for this test are df = n - 1 = 9. We can use a t-distribution table or a calculator to find the p-value associated with this t-statistic and degrees of freedom.

Using a t-distribution table with df = 9, we find that the p-value for a one-tailed test at the 3% level is less than 0.001. This means that the probability of observing a t-statistic as extreme as -4.26, assuming the null hypothesis is true, is less than 0.001.

Since the p-value is less than the significance level of 0.03, we reject the null hypothesis and conclude that there is enough evidence to show that the mean carbon dioxide emission is now lower than it was in 2004 at the 3% level.

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There are 36 integers from 1 to 100 that are multiples of 4 or multiples of 7, and there are 64 integers that are neither multiples of 4 nor 7.

The group of counting numbers that can be written without a fractional component includes zero and both positive and negative integers. An integer can, as was already established, be either positive, negative, or zero.

To find how many integers from 1 to 100 are multiples of 4 or multiples of 7, we can use the principle of inclusion-exclusion. We start by counting the number of integers that are multiples of 4 and the number of integers that are multiples of 7:

- There are 25 multiples of 4 from 1 to 100 (4, 8, 12, ..., 96, 100).

- There are 14 multiples of 7 from 1 to 100 (7, 14, 21, ..., 91, 98).

However, we have double-counted the integers that are multiples of both 4 and 7 (i.e., multiples of 28). There are 3 such integers from 1 to 100 (28, 56, 84). So, the total number of integers that are multiples of 4 or multiples of 7 is:

25 + 14 - 3 = 36

To find how many integers are neither multiples of 4 nor 7, we can subtract the number of integers that are multiples of 4 or 7 from the total number of integers from 1 to 100:

100 - 36 = 64

Therefore, there are 36 integers from 1 to 100 that are multiples of 4 or multiples of 7, and there are 64 integers that are neither multiples of 4 nor 7.

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For using substraction, in Janice's account balance with beginning of $467 amount, the ending bank balance of his account after some withdraw through checks and ATM is equals to $371.08.

We have Janice's bank balance account data. In Begining bank balance of his account = $467

Amount that she withdrawal through ATM = $30

The 4 checks'amount are the following $16.80, $22.74, $12.38, and $14. We have to determine the her ending bank balance.. We use substraction arithmetic operation for determining the ending bank balance. First we add all withdraw amounts from account to calculate total withdraw. So, total withdraw from account = $16.80+ $22.74 + $12.38 + $14 + $30 = $95.92

Now, the ending bank balance= $467 - $95.92 = $371.08

Hence, required bank balance is $371.08.

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The selling price of the computer was $8507.52.

We have,

If the businessman incurred a loss of 21% on the cost price, then the selling price (SP) must have been 79% of the cost price (CP), since:

SP = CP - Loss

SP = CP - 0.21 x CP

SP = 0.79 x CP

We know that the cost price was $10768, so we can substitute this value into the equation above to find the selling price:

SP = 0.79 x CP

SP = 0.79 x $10768

SP = $8507.52

Therefore,

The selling price of the computer was $8507.52.

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The ending balance of the money that was invested would be =$1150

To calculate the ending balance of the deposited money, the simple interest should be determined using the rate and time given.

The formula for simple interest = principal×time×rate/100

principal = $1,000

time = 5 years

rate = 3%

simple interest = 1000×5×3/100

= 15000/100

=$150

Therefore the end balance = 1000+150 = $1150

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The number 6.34 repeating is an irrational number because it can be expressed as a fraction of two integers.

The number 6.34 repeating is irrational.

An irrational number cannot be expressed as the ratio of two integers, and it has an infinite number of non-repeating decimal places.

In this case, 6.34 repeating can be expressed as 6.34343434..., where the digits "34" repeat infinitely.

This cannot be expressed as a ratio of two integers because there is no repeating pattern that can be represented by a fraction.

Therefore, 6.34 repeating is irrational.

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The percent of area under a normal curve between the mean and −1.18 standard deviations is 38.10% and between z=−1.6 and z = 0.7 is 70.32% and the​ z-score that best satisfies the condition is z=−0.4.

To find the percent of area under a normal curve between the mean and −1.18 standard deviations from the mean, we need to use a standard normal distribution table or calculator.

The area to the left of −1.18 standard deviations is 0.1190, and the area to the left of the mean is 0.5000. To find the area between them, we subtract the smaller area from the larger area:

0.5000 - 0.1190 = 0.3810

Therefore, the percent of area under a normal curve between the mean and −1.18 standard deviations is 38.10%.

To find the percent of the total area under the standard normal curve between z=−1.6 and z = 0.7, we again need to use a standard normal distribution table or calculator.

The area to the left of −1.6 is 0.0548, and the area to the left of 0.7 is 0.7580. To find the area between them, we subtract the smaller area from the larger area:

0.7580 - 0.0548 = 0.7032

Therefore, the percent of the total area between z=−1.6 and z = 0.7 is 70.32%.

To find the​ z-score that best satisfies the condition that 36% of the total area is to the left of z, we need to use a standard normal distribution table or calculator.

We look for the z-score that corresponds to a cumulative probability of 0.36. This is approximately −0.4, which means that 36% of the total area under the standard normal curve is to the left of z=−0.4. Therefore, the​ z-score that best satisfies the condition is z=−0.4.

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The 95% confidence interval for the true mean weight, H, of all packages received by the parcel service is (21.2 pounds, 22.8 pounds), which corresponds to option b) 21.2 to 22.8 pounds

To calculate the 95% confidence interval for the true mean weight, H, of all packages received by the parcel service, we will use the following terms and steps:

1. Sample mean (x): 22.0 pounds
2. Sample size (n): 43 packages
3. Standard deviation (σ): 2.7 pounds
4. Confidence level: 95%

Step 1: Calculate the standard error (SE) by dividing the standard deviation (σ) by the square root of the sample size (n). [tex]SE= \frac{σ}{\sqrt{n} }[/tex]

[tex]SE=\frac{2.7}{\sqrt{43} } = 0.4114[/tex]

Step 2: Determine the critical value (z) for the 95% confidence level. For a 95% confidence interval, the z-value is 1.96.

Step 3: Calculate the margin of error (ME) by multiplying the standard error (SE) by the critical value (z). ME = SE × z

ME = 0.4114 × 1.96 = 0.806

Step 4: Calculate the lower and upper bounds of the confidence interval using the sample mean (x) and margin of error (ME).

Lower bound = x - ME = 22.0 - 0.806 = 21.2 pounds
Upper bound = x + ME = 22.0 + 0.806 = 22.8 pounds

So, the 95% confidence interval for the true mean weight, H, of all packages received by the parcel service is (21.2 pounds, 22.8 pounds), which corresponds to option b) 21.2 to 22.8 pounds.

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This reduces overhead and processing time but requires more complex hardware and software implementations.

To calculate the number of bits in 5.3 TB of data, we first convert TB to bytes by multiplying 5.3 by 10^12 (since 1 TB [tex]= 10^12[/tex] bytes). This gives us [tex]5.3 x 10^12[/tex] bytes. To convert bytes to bits, we multiply by 8 (since 1 byte = 8 bits). Thus, the total number of bits in 5.3 TB of data is:

[tex]5.3 x 10^12[/tex] bytes x 8 bits/byte[tex]= 4.24 x 10^13[/tex] bits

Therefore, there are [tex]4.24 x 10^13[/tex] bits in 5.3 TB of data.

To calculate the average access time for the four levels of memory, we use the formula:

Average Access Time = (Hit Rate1 x Access Time1) + (Hit Rate2 x Access Time2) + (Hit Rate3 x Access Time3) + (Hit Rate4 x Access Time4)

where Hit Rate is the percentage of memory accesses found at each level, and Access Time is the access time for that level of memory.

Given that 62% of memory accesses are found in Level 1, 19% by Level 2, 12% by Level 3, and the remaining 7% by Level 4, and the access times for each level, we can calculate the average access time as:

Average Access Time = (0.62 x 0.018µs) + (0.19 x 0.07µs) + (0.12 x 0.045µs) + (0.07 x 0.23µs)

= 0.02796µs + 0.0133µs + 0.0054µs + 0.0161µs

= 0.06276µs

Therefore, the average access time for the four levels of memory is 0.06276µs.

The two possible options to handle multiple interrupts are:

a) Polling: This is a simple method where the processor continuously checks each device to see if it requires attention. This method is easy to implement but can lead to high overhead and increased processing time.

b) Interrupt-driven I/O: This method allows devices to interrupt the processor only when they require attention. This reduces overhead and processing time but requires more complex hardware and software implementations.

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The area of the figure is 23.5 in².

Given is shape we need to find the area of the same,

For finding the same,

We will find the area of the rt. triangle with height 9 in and base 7 in.

Then we will subtract the area of the rectangle with dimension 2 x 4.

So,

The required area = (1/2 x 9 x 7) - (2 x 4) = 23.5 in²

Hence, the area of the figure is 23.5 in².

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The angle subtended by an arc 1.60 m in length on the circumference of a circle of radius 2.50 m is approximately 115.2°.

To find the angle subtended by an arc of 1.60 m in length on the circumference of a circle with a radius of 2.50 m, you can follow these steps:

Recall the formula for the length of an arc: Arc Length = (Central Angle × Radius)/180°, where the central angle is in degrees and the radius is in meters.

Rearrange the formula to solve for the central angle: Central Angle = (Arc Length × 180°) / Radius

Plug in the given values: Central Angle = (1.60 m × 180°) / 2.50 m

Calculate the result: Central Angle = (1.60 × 180) / 2.50 ≈ 115.2°

The angle subtended by an arc 1.60 m in length on the circumference of a circle of radius 2.50 m is approximately 115.2°.

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Total cost without items 2 and 4 = Sum(new price vector * adjusted quantity vector)

To get the average price of the items, sum the elements in vector p and divide by the number of elements (5 in this case).
Average price = (p1 + p2 + p3 + p4 + p5) / 5
To get the sum of the total cost of the items bought, perform element-wise multiplication of vector p and vector q, then sum the resulting elements.
Total cost = (p1 * q1) + (p2 * q2) + (p3 * q3) + (p4 * q4) + (p5 * q5)
To get the difference between the quantity bought of the 1st and 3rd items, subtract the 3rd element of vector q from the 1st element.
Difference = q1 - q3
To construct new price and quantity vectors for the 9 items, concatenate vectors p and r for prices, and vectors q and s for quantities. Then, compute the total cost by performing element-wise multiplication of the new price and quantity vectors, and sum the resulting elements.
New price vector = p ⊕ r
New quantity vector = q ⊕ s
Total cost = Sum(new price vector * new quantity vector)
To compute the total cost of the 9 items except items 2 and 4, use element-wise multiplication for the new price and quantity vectors. Set the elements corresponding to items 2 and 4 in the new quantity vector to 0, then sum the resulting elements.
Adjusted quantity vector = new quantity vector with 2nd and 4th elements set to 0
Total cost without items 2 and 4 = Sum(new price vector * adjusted quantity vector)

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The answer is True, individuals from high-income countries more likely to meet physical activity guidelines compared to individuals from low-income countries because they have more access to resources and facilities needed to be active.

Individuals from high-income countries are more likely to meet physical activity guidelines compared to individuals from low-income countries because they have more access to the resources and facilities needed to be active. This is because higher-income countries generally have better infrastructure, more public spaces for physical activities, and greater access to fitness facilities, which enable individuals to engage in regular exercise and maintain an active lifestyle.

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The shipping fee is given as follows:

C. $6.00.

The slope-intercept representation of a linear function is given by the equation presented as follows:

y = mx + b

The coefficients of the function and their meaning are described as follows:

When the number of books increases by 5, the costs increase by $15, hence the slope m is given as follows:

m = 15/5

m = 3.

Hence:

y = 3x + b.

When x = 5, y = 21, hence the intercept b, representing the shipping fee, is obtained as follows:

21 = 3(5) + b

b = $6.00.

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Answer:

16/22, 24/33, and 40/55

or

72.7272...% = Percentage form

0.7272... = Decimal form

Hope this helps :)

Pls brainliest...

If the solution is indeed n = -2, then step 8 would be unnecessary, and the last line of the justification would be as stated above. The last line of the justification would typically be "Therefore, n = -2 is a solution to the equation 4n + 2 = 2n + 3 and the solution has been verified."

The justification would likely involve the following steps:

Start with the equation 4n + 2 = 2n + 3.

Simplify the equation by subtracting 2n from both sides: 2n + 2 = 3.

Subtract 2 from both sides: 2n = 1.

Divide both sides by 2: n = 1/2.

Check the solution by substituting n = -2 back into the original equation: 4(-2) + 2 = 2(-2) + 3.

Simplify: -8 + 2 = -4 + 3.

Further simplify: -6 = -1.

Since the equation is not true when n = -2, but instead it is true when n = 1/2, the solution of n = -2 is not correct and needs to be revised.

However, if the solution is indeed n = -2, then step 8 would be unnecessary, and the last line of the justification would be as stated above.

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The line integral evaluated using Green's Hypothesis is 32π where c is counterclockwise around the circle with the center of the origin and radius 4(a).

To begin with, let's parameterize the circle with the center at the beginning and span 4. We are able to utilize the standard parametrization of a circle:

x = 4cos(t)

y = 4sin(t)

where t goes from to 2π as we navigate the circle counterclockwise.

(a) Coordinate assessment of the line fundamentally:

We have:

(x - y)dx + (xy)dy = (4cos(t) - 4sin(t))(-4sin(t)dt) + (4cos(t)*4sin(t))(4cos(t)dt)

=[tex]-16cos(t)sin(t)dt + 16cos^2(t)sin(t)dt[/tex]

= 16sin(t)cos(t)(cos(t) - sin(t))dt

Presently we will coordinate this expression over the interim [0, 2π]:

∫(x - y)dx + (xy)dy = ∫[0,2π] 16sin(t)cos(t)(cos(t) - sin(t))dt=0

Subsequently, the line necessarily is break even with zero when assessed specifically.

(b) Utilizing Green's Hypothesis:

Green's Hypothesis relates a line indispensably around a closed bend to a twofold fundamentally over the region enclosed by the bend.

Particularly, in the event that C may be a closed bend that encases a locale R within the plane, and in the event that F = P i + Q j could be a vector field whose component capacities have nonstop halfway subordinates all through R, at that point:

∫C Pdx + Qdy = ∬R ( ∂Q/∂x - ∂P/∂y ) dA

In this case, able to take P = x - y and Q = xy, so that:

∂Q/∂x = y and ∂P/∂y = -1

At that point, applying Green's Hypothesis, we have:

∫C (x - y)dx + (xy)dy = ∬R ( ∂Q/∂x - ∂P/∂y ) dA

= ∬R (y + 1) dA

The locale R may be a circle with a center at the beginning and span 4, so able to express the fundamentally as:

∬R (y + 1) dA = ∫[0,2π] ∫[0,4] (rsin(t) + 1) rdrdt

= 2π(16) = 32π

Therefore, the line integral evaluated using Green's Hypothesis is 32π.

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We first need to clarify a few terms and the question itself. It seems like you are asking about a codeword in polynomial form and finding the third circular shift of the codeword. Let's express the codeword in polynomial form:

Let u(x) be the original polynomial codeword, and let n = 4. Based on the information provided, assuming that q(x) = u(x)n(x) = u(x)(1 + x^4).

To find the third circular shift of the codeword, follow these steps:

1. Express the original codeword u(x) in polynomial form, for example, u(x) = a_0 + a_1x + a_2x^2 + a_3x^3 (where a_i are coefficients).
2. Perform the first circular shift by moving the last term to the front: a_3x^3 + a_0 + a_1x + a_2x^2.
3. Perform the second circular shift: a_2x^2 + a_3x^3 + a_0 + a_1x.
4. Perform the third circular shift: a_1x + a_2x^2 + a_3x^3 + a_0.

The third circular shift of the codeword u(x) is given by the polynomial a_1x + a_2x^2 + a_3x^3 + a_0.

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The input x = 6 is mapped to different values, thus, the relation is not a function.

A relationship is a function only if all the inputs are mapped to a single output (this means that each value of the domain is mapped into only one of the values of the range)

Now, the given relation is the following one:

(6, 3), (5, 6), (-1, 1), (6, 9), (8,8)

If you look at the first and the fourth coordinate pairs, you can see that in both cases the inputs are 6.

And the outputs are different, then that input is being mapped to two different values, thus, the relation is not a function.

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In the given triangle, the measure of side c is approximately 39 m

From the question, we are to calculate the measure of side c in the given triangle.

To determine the measure of side c, we will use SOH CAH TOA

sin (angle) = Opposite / Hypotenuse

cos (angle) = Adjacent / Hypotenuse

tan (angle) = Opposite / Adjacent

In the given diagram,

Angle = 29°

Opposite = 19 m

Hypotenuse = c

Thus

sin (29°) = 19 / c

0.4848 = 19 / c

c = 19 / 0.4848

c = 39.1914

c ≈ 39 m

Hence,

The measure of c is 39 m

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The radius of the sphere is approximately 5.22. The equation of the sphere is x^2 + y^2 + z^2 - 7x + 3y - 2z = 14.6784.

To find the centre of the sphere, we first need to find the midpoint of the diameter. Using the midpoint formula, we have:
Midpoint = ((5+2)/2, (-1-2)/2, (6+(-4))/2) = (3.5, -1.5, 1)
Therefore, the centre of the sphere is (3.5, -1.5, 1).
To find the radius of the sphere, we need to find the distance between the centre and one of the endpoints of the diameter. Using the distance formula, we have:
r = √[(5-3.5)^2 + (-1-(-1.5))^2 + (6-1)^2] = √[(1.5)^2 + (0.5)^2 + (5)^2] = √(27.25) ≈ 5.22
Therefore, the radius of the sphere is approximately 5.22.
The standard equation of a sphere with centre (h,k,l) and radius r is:
(x-h)^2 + (y-k)^2 + (z-l)^2 = r^2
Plugging in the values we found, we have:
(x-3.5)^2 + (y-(-1.5))^2 + (z-1)^2 = (5.22)^2
Expanding and simplifying, we get:
x^2 - 7x + 12.25 + y^2 + 3y + 2.25 + z^2 - 2z + 1 = 27.3284
Rearranging and simplifying further, we get:
x^2 + y^2 + z^2 - 7x + 3y - 2z = 14.6784
Therefore, the equation of the sphere is x^2 + y^2 + z^2 - 7x + 3y - 2z = 14.6784.

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Answer:

6 mph

Step-by-step explanation:

Let’s call the speed of the ferry in still water v. Then, we can use the formula:

distance = rate × time

to set up two equations for the trip upriver and downriver:

24 = (v - 6) × t1

24 = (v + 6) × t2

where t1 is the time it takes to travel upriver and t2 is the time it takes to travel downriver.

We also know that the total time for the round trip is 8 hours:

t1 + t2 = 8

We can solve this system of equations by first solving for t1 and t2 in terms of v:

t1 = 24 / (v - 6)

t2 = 24 / (v + 6)

Substituting these expressions into the equation for total time gives:

24 / (v - 6) + 24 / (v + 6) = 8

Multiplying both sides by (v - 6)(v + 6) gives:

24(v + 6) + 24(v - 6) = 8(v - 6)(v + 6)

Simplifying this equation gives:

48v = 288

So v = 6.

Therefore, the speed of the ferry in still water is 6 mph.

I hope this helps! Let me know if you have any other questions.

The angle between lines L and L2 is approximately 33.23 degrees.

To find the angle between the two lines, we can use the dot product formula:

where L1 and L2 are the direction vectors of the two lines.

For line L1, the direction vector is <1, 3, 0>. For line L2, the direction vector is <8, 6, 0>. We can calculate the dot product and the magnitudes:

Plugging in these values to the formula, we get:

cos(θ)= 26 / (√(10) * 10) = 0.818

θ = acos(0.818) = 33.23 degrees

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The probability of randomly selecting a park that neither allows camping nor has a playground is 31/77.

We have,

We know that there are 59 parks that allow camping, 76 parks that have playgrounds, and a total of 154 parks.

Number of parks that allow camping only = 59 - 14 = 45

Number of parks that have playgrounds only = 76 - 14 = 62

Number of parks that have both camping and playgrounds = 14

The number of parks that neither allow camping nor have a playground.

= Total number of parks - (number of parks that allow camping only + number of parks that have playgrounds only - number of parks that have both camping and playgrounds)

= 154 - (45 + 62 - 14)

= 61

Now,

The probability of randomly selecting a park that neither allows camping nor has a playground.

= 61/154

= 31/77

Thus,

The probability of randomly selecting a park that neither allows camping nor has a playground is 31/77.

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The kernel of the given function is the set {v}.

The function you've provided is fv(w) = w - v, where v is a fixed vector in ℝ³.

To prove that this function is a linear transformation, we need to show that it satisfies two properties:

1. Additivity: fv(w1 + w2) = fv(w1) + fv(w2) for all w1, w2 in ℝ³
2. Homogeneity: fv(c * w) = c * fv(w) for all w in ℝ³ and scalar c

Let's check both properties:

1. Additivity:
fv(w1 + w2) = (w1 + w2) - v = w1 - v + w2 - v = fv(w1) + fv(w2)

2. Homogeneity:
fv(c * w) = (c * w) - v = c * (w - v) = c * fv(w)

Since the function fv(w) satisfies both additivity and homogeneity, it is a linear transformation.

Now, let's find the kernel of this function. The kernel is the set of all vectors w for which fv(w) = 0.
fv(w) = 0

=> w - v = 0

=> w = v

Therefore, the kernel of this function is the set containing only the fixed vector v.

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The consumers' surplus if the market price is set at $6/disc is  $2,167.2.

The consumer's surplus is calculated from the quantity demanded as shown below;

-0.01x² − 0.2x + 54 = 6

-0.01x² - 0.2x + 48 = 0

solve the quadratic equation using formula method as follows;

x = -80 or 60

So we take only the positive quantity demanded.

Integrate the function from 0 to 60;

∫-0.01x² − 0.2x + 54 = [-0.0033x³ - 0.1x² + 54x]

= [-0.0033(60)³ - 0.1(60)² + 54(60)] - [-0.0033(0)³ - 0.1(0)² + 54(0)]

= -712.8 - 360 + 3,240

= $2,167.2

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Answer:

72 cm

Step-by-step explanation:

24cm x 3 = 72cm

A= 72cm

Answer:

27cm

Step-by-step explanation:

24=p w=x         L=3x

x+x+3x+3X=24

8X=24

X=3

w=3

L=9

3*9=27

A=27

The area of a regular polygon with perimeter of 58 and apothem 10 is 290 square units

It is important to note that the formula for calculating the area of a regular polygon is expressed as;

A = 1/2(ap)

This is so, such that the parameters of the formula are given as;

Now, substitute the values into the equation;

Area = 1/2 × 58 × 10

Multiply the values

Area = 580/2

Divide the values, we get;

Area = 290 square units

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The cost per widget based on the given data is decreasing by $0.616 for every one-unit increase in volume, and the predicted cost when volume is zero is $36.94.

To determine the cost per widget based on the given data, we need to find the slope of the regression line. The slope of the regression line represents the change in cost for a one-unit change in volume.

We can use the formula for the slope of the regression line:

slope = r(Sy/Sx)

where r is the correlation coefficient, Sy is the standard deviation of Y (cost), and Sx is the standard deviation of X (volume).

From the given data, we can calculate the following:

r = -0.75 (negative correlation between cost and volume)

Sy = 4.5 (standard deviation of cost)

Sx = 5.5 (standard deviation of volume)

Substituting these values into the formula for slope, we get:

slope = -0.75(4.5/5.5) = -0.616

Therefore, the cost per widget is decreasing by $0.616 for every one-unit increase in volume.

To find the actual cost per widget, we need to look at the intercept of the regression line. The intercept represents the predicted cost when volume is zero.

We can use the formula for the intercept of the regression line:

intercept = y - slope(x)

where y is the mean of Y (cost), slope is the slope of the regression line, and x is the mean of X (volume).

From the given data, we can calculate the following:

y = $10.50 (mean of cost)

x = 40 (mean of volume)

Substituting these values into the formula for intercept, we get:

intercept = 10.50 - (-0.616)(40) = $36.94

Therefore, the cost per widget is approximately $36.94 when volume is zero.

In summary, the cost per widget based on the given data is decreasing by $0.616 for every one-unit increase in volume, and the predicted cost when volume is zero is $36.94.

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