Please help! will give brainlist

Answer:

$18.68

Step-by-step explanation:

We Know

Ivan is buying $18.81 worth of produce.

He has his own bag and gets a $0.13 discount.

How much will Ivan pay after the discount?

We Take

18.81 - 0.13 = $18.68

So, Ivan will pay $18.68 after the discount.

Step-by-step explanation:

Here is the first one as an EXAMPLE...you can do the rest of them

Intercepted arcs = 45 and 109 degrees

  AED = (45 + 109) / 2 = 77 degrees     ( angle BEC has the same measure)

Answer:

Danny owns 15 shirts.

Step-by-step explanation:

We know

Danny has 6 orange-colored shirts; this is 40% of the shirt he owns.

How many shirts does Danny own?

We Take

(6 ÷ 40) x 100 = 15 shirts

So, Danny owns 15 shirts.

Answer:  15 shirts

Step-by-step explanation:

Step 1: We know that Danny has 6 orange shirts, which is 40% of the total number of shirts he owns.

Step 2: To find out the total number of shirts Danny owns, we can use the following formula:

Total number of shirts = (Number of orange shirts ÷ Percentage of orange shirts) × 100

Plugging in the values, we get:

Total number of shirts = (6 ÷ 40) × 100 = 15

Therefore, Danny owns a total of 15 shirts.

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The solution of expression is,

⇒ x (x + 1) / (x + 3)²

We haver to given that,

An expression to solve,

⇒ x / (x + 3) / 1 / (x + 1)/ (x + 3)

We can simplify it as,

⇒ x / (x + 3) / 1 / (x + 1) / (x + 3)

⇒ x / (x + 3) ÷ 1 / (x + 1) ÷ (x + 3)

⇒ x / (x + 3) × (x + 1) /1 × 1/(x + 3)

⇒ x (x + 1) / (x + 3)²

Therefore, The solution of expression is,

⇒ x (x + 1) / (x + 3)²

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The values of a nurse records the pulses of 10 of his patients are S- = 3, nu = 2, and S+ = 5.

To determine S-, nu, and S+, we need to calculate the median pulse and then perform calculations based on that.

Step 1: Calculate the median pulse:

Arrange the pulse recordings in ascending order: 61, 77, 78, 88, 88, 90, 91, 91, 93, 95.

The middle value(s) will represent the median pulse.

Since we have 10 recordings, the middle two values are the 5th and 6th values: 88 and 90.

The median pulse is the average of these two values: (88 + 90) / 2 = 89.

Step 2: Calculate S- (number of pulse recordings below the median):

Count the number of pulse recordings below the median (89):

There are 3 recordings below 89: 61, 77, and 78.

S- = 3.

Step 3: Calculate nu (number of pulse recordings equal to the median):

Count the number of pulse recordings equal to the median (89):

There are 2 recordings equal to 89: 88 and 88.

nu = 2.

Step 4: Calculate S+ (number of pulse recordings above the median):

Count the number of pulse recordings above the median (89):

There are 5 recordings above 89: 90, 91, 91, 93, and 95.

S+ = 5.

Therefore, the values of a nurse records the pulses of 10 of his patients are S- = 3, nu = 2, and S+ = 5.

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Answer:

5x10^6

Step-by-step explanation:

The snowfall in February should be greater than the difference between the average winter snowfall and the sum of snowfall in December and January.

To determine how much snow is required in February to exceed the average winter snowfall, we need to calculate the total snowfall for the three months and compare it to the average.

Let's assume the average winter snowfall for December, January, and February is represented by the variable "A" (in inches).

Given that the city receives "B" inches of snow in December and "C" inches of snow in January, we need to find the snowfall in February, denoted by "D," such that the total snowfall for the three months exceeds the average.

The total snowfall for the three months is given by the sum of the snowfall in each month:

Total snowfall = B + C + D

To exceed the average, we need the total snowfall to be greater than the average:

Total snowfall > A

Substituting the values, we have:

B + C + D > A

To find the required snowfall in February, we isolate the variable "D" on one side of the inequality:

D > A - (B + C)

Therefore, the snowfall in February should be greater than the difference between the average winter snowfall and the sum of snowfall in December and January.

Please note that the values for "A," "B," and "C" need to be provided in order to calculate the required snowfall in February.

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The wavelength of the ripples is approximately 3.6 meters, the frequency is approximately 0.476 cycles/second, and the speed of the ripples is approximately 1.714 meters/second.

Nick and Kara were relaxing on rafts in the shallow waters of Lake Bluebird beach, with a distance of 1.8 meters between them. As a motorboat sped by, it created ripples that propagated towards Nick and Kara. The rafts started to oscillate, experiencing exactly 4 complete cycles of upward and downward motion in a time span of 8.4 seconds. At the high point of Nick's raft, Kara's raft was at its low point, and there were no crests between their rafTo determine the wavelength, frequency, and speed of the ripples, we can use the given information.

The number of complete cycles (up and down motion) is 4, and the time it took for these cycles to occur is 8.4 seconds.

Frequency (f) can be calculated as the number of cycles divided by the time:

f = 4 cycles / 8.4 seconds = 0.476 cycles/second

The wavelength (λ) is the distance between two consecutive crests or troughs. Since there are no crests between Nick and Kara's rafts, the distance between them (1.8 meters) corresponds to half a wavelength (λ/2).

Therefore, the wavelength can be calculated as:

λ = 1.8 meters × 2 = 3.6 meters

The speed of the ripples can be calculated using the formula:

v = λ × f

Substituting the values, we get:

v = 3.6 meters × 0.476 cycles/second ≈ 1.714 meters/second

Therefore, the wavelength of the ripples is approximately 3.6 meters, the frequency is approximately 0.476 cycles/second, and the speed of the ripples is approximately 1.714 meters/second.

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The correct interpretation of each slope in multiple regression is option b: "The predicted change in the response variable for a one unit increase in that predictor variable, while holding all other predictor variables constant."

This means that for each predictor variable, we are estimating how much the response variable will change when that predictor variable increases by one unit, assuming all other predictor variables remain constant. This allows us to isolate the effect of each predictor variable on the response variable and determine which variables are most important in predicting the response variable.

Option a is incorrect because it assumes that the predictor variable can be equal to 0, which may not be possible or meaningful for all predictor variables. Option c is incorrect because it does not account for the effects of other predictor variables. Option d is incorrect because it refers to the proportion of variability explained by a predictor variable, which is captured by the R-squared statistic, but not by the slope. Option e is partially correct, but the holding of all other predictor variables constant is the key aspect of the interpretation.

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Answer: descriptive statistics

Step-by-step explanation: The average age of everyone in the class is an example of descriptive statistics.

By introducing an additional association between an input value and multiple output values, such as assigning 4 to both 1 and 3, we can make the relation not represent a function.

In order for a relation to represent a function, each input value (x) must have a unique corresponding output value (y). If there is any input value that is associated with multiple output values, the relation does not represent a function.

Looking at the given table:

Input: 7 7 4 5

Output: 2 5 1 2

We can see that the input value of 7 is associated with two different output values, 2 and 5. This violates the requirement for a function because an input value should have only one corresponding output value.

To make the relation not represent a function, we need to choose a value that will introduce another instance where an input value is associated with multiple output values.

Let's choose an input value that already exists in the table, such as 4. Currently, the input value 4 is associated with an output value of 1. To make the relation not represent a function, we can associate 4 with another output value, let's say 3.

Updated relation:

Input: 7 7 4 4 5

Output: 2 5 1 3 2

Now, the input value of 4 is associated with two different output values, 1 and 3. Therefore, the relation does not represent a function.

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[tex] \sf {3x}^{2} - 11x - 4 = 0[/tex]

[tex] \sf {3x}^{2} + x - 12x- 4[/tex]

[tex] \sf x(3x + 1) - 4(3x + 1)[/tex]

[tex] \sf (x- 4)(3x + 1)[/tex]

[tex]\sf x=4\: and\: x= \frac{-1}{3}[/tex]

The difference in the elevation is A = 30,143 ft.

Given data ,

To represent the difference in elevation between the mountain in the Great Smoky Mountains National Park and the gap in the Atlantic Ocean, we need to calculate the absolute difference between their elevations.

The elevation of the mountain is 5651 feet above sea level, while the elevation of the gap in the Atlantic Ocean is 24,492 feet below sea level.

To find the difference in elevation, we subtract the elevation of the gap from the elevation of the mountain:

On simplifying the equation , we get

Difference in elevation = Elevation of the mountain - Elevation of the gap

= 5651 ft - (-24492 ft)

= 5651 ft + 24492 ft

= 30143 ft

Hence , the difference in elevation between these two points is 30,143 ft

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Answer:

it is a wrong question because the cannot not be fish chips 7c the cn onl be 0.67c

To find the median of the random variable with the given probability density function f(x) = 0.09e^(-0.09x) on the interval [0, +∞), we need to determine the value of x at which the cumulative distribution function (CDF) reaches 0.5. The median represents the point at which half of the probability is below and half is above.

The probability density function (PDF) f(x) describes the relative likelihood of the random variable taking on different values. In this case, the PDF is given by f(x) = 0.09e^(-0.09x) on the interval [0, +∞).

To find the median, we need to calculate the cumulative distribution function (CDF), which represents the accumulated probability up to a certain point. The CDF is found by integrating the PDF from the lower bound of the interval to x. In this case, the CDF is given by F(x) = ∫[0, x] (0.09e^(-0.09t)) dt.

We need to find the value of x for which F(x) = 0.5, as the median represents the point where half of the probability is below and half is above. Solving the equation F(x) = 0.5 will give us the median value for the random variable.

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The pair of equations that would have (-1, 2) as a solution is (3) y = x² - 3x - 2 and y = 4x + 6.

To determine which pair of equations would have (-1, 2) as a solution, we can substitute the values x = -1 and y = 2 into each equation and see which pair satisfies both equations.

Let's test each option:

(1) y = x + 3 and y = 2^x:

Substituting x = -1 and y = 2 into the first equation:

2 = -1 + 3

2 = 2 (correct)

Substituting x = -1 and y = 2 into the second equation:

2 = 2^-1

2 = 1/2 (not correct)

(2) y = x - 1 and y = 2x:

Substituting x = -1 and y = 2 into the first equation:

2 = -1 - 1

2 = -2 (not correct)

Substituting x = -1 and y = 2 into the second equation:

2 = 2(-1)

2 = -2 (not correct)

(3) y = x² - 3x - 2 and y = 4x + 6:

Substituting x = -1 and y = 2 into the first equation:

2 = (-1)² - 3(-1) - 2

2 = 1 + 3 - 2

2 = 2 (correct)

Substituting x = -1 and y = 2 into the second equation:

2 = 4(-1) + 6

2 = -4 + 6

2 = 2 (correct)

(4) 2x + 3y = -4 and y :

Substituting x = -1 and y = 2 into the first equation:

2(-1) + 3(2) = -4

-2 + 6 = -4

4 = -4 (not correct)

Based on the tests, the pair of equations (3) y = x² - 3x - 2 and y = 4x + 6 would have (-1, 2) as a solution.

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The expected value of purchasing a lottery ticket in this game is $7.75 when a lottery game is played where the player chooses a three digit number (repetition allowed).

What is expected value?

Expected value, also known as the mean or average value, is a concept used in probability theory and statistics to quantify the long-term average outcome of a random variable.

To determine the expected value of purchasing a lottery ticket, we need to calculate the probability of winning and the corresponding payout, and then subtract the cost of the ticket.

In this lottery game, the player chooses a three-digit number, and a three-digit number is chosen at random. Since repetition is allowed, there are a total of 1,000 possible three-digit numbers (000 to 999) that can be chosen.

The probability of winning the lottery depends on the specific number chosen by the player. There is only one winning number, and it must match the player's number in the correct order. Since the order matters, the probability of winning for any specific chosen number is 1/1,000.

The payout for winning is $8,750.

Now, let's calculate the expected value. We subtract the cost of the ticket ($1) from the expected winnings:

Expected value = (Probability of winning) × (Payout) - (Cost of ticket)

             = (1/1,000) × ($8,750) - ($1)

             = $8.75 - $1

             = $7.75

Therefore, the expected value of purchasing a lottery ticket in this game is $7.75.

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To prove that 3 divides n^3 + 2n for any positive integer n, we need to show that there exists an integer k such that n^3 + 2n = 3k.

Let's proceed with the proof using mathematical induction:

Base case:

For n = 1, we have 1^3 + 2(1) = 1 + 2 = 3, which is divisible by 3. So the statement holds true for n = 1.

Inductive hypothesis:

Assume that the statement holds true for some positive integer k, i.e., k^3 + 2k = 3m, where m is an integer.

Inductive step:

We need to prove that the statement holds true for k + 1, i.e., (k + 1)^3 + 2(k + 1) = 3p, where p is an integer.

Expanding the expression (k + 1)^3 + 2(k + 1):

= k^3 + 3k^2 + 3k + 1 + 2k + 2

= (k^3 + 2k) + 3k^2 + 3k + 3

= 3m + 3k^2 + 3k + 3

= 3(m + k^2 + k + 1)

From the inductive hypothesis, we know that k^3 + 2k = 3m. Substituting this in the above expression:

= 3m + 3k^2 + 3k + 3

= 3(m + k^2 + k + 1)

We can see that the expression is a multiple of 3, with (m + k^2 + k + 1) as the coefficient.

Since m, k, and 1 are integers, (m + k^2 + k + 1) is also an integer. Therefore, (k + 1)^3 + 2(k + 1) is divisible by 3.

By using mathematical induction, we have proved that for any positive integer n, 3 divides n^3 + 2n.

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True. The r command "qt(0.95, 7)" calculates the critical value of the distribution with 7 degrees of freedom at a significance level of 0.05 and a two-tailed test. The "qt" function in R is used to find the critical value of a t-distribution for a given probability and degrees of freedom.

In this case, the command returns the critical value of the t-distribution with 7 degrees of freedom at a significance level of 0.05, which can be used to perform hypothesis testing or confidence interval calculations. It is important to note that the critical values of the t-distribution change as the degrees of freedom change, and different significance levels require different critical values. Answering in more than 100 words, it is necessary to understand the concept of degrees of freedom in statistics. Degrees of freedom represent the number of independent observations that are available for estimation in a statistical model. The number of degrees of freedom depends on the sample size, the number of parameters being estimated, and any constraints on the model. In general, more degrees of freedom lead to greater precision in estimates and narrower confidence intervals.

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The exact length of the curve defined by the parametric equations x = 7t^2 and y = 36t^3, where 0 ≤ t ≤ 1, is approximately 128.47 units.

To find the exact length of the curve defined by the parametric equations x = 7t^2 and y = 36t^3, where 0 ≤ t ≤ 1, we can use the arc length formula for parametric curves:

L = ∫ [a, b] √(dx/dt)^2 + (dy/dt)^2 dt

In this case, a = 0 and b = 1.

Let's calculate the derivatives dx/dt and dy/dt:

dx/dt = d/dt (7t^2) = 14t

dy/dt = d/dt (36t^3) = 108t^2

Now, we can substitute these derivatives into the arc length formula:

L = ∫ [0, 1] √(14t)^2 + (108t^2)^2 dt

L = ∫ [0, 1] √(196t^2 + 11664t^4) dt

To solve this integral, we can simplify the expression inside the square root:

L = ∫ [0, 1] √(4t^2(49 + 2916t^2)) dt

L = ∫ [0, 1] 2t√(49 + 2916t^2) dt

Next, we can make a substitution to simplify the integrand further. Let u = 49 + 2916t^2, then du = 5832t dt.

When t = 0, u = 49, and when t = 1, u = 49 + 2916 = 2965.

Now, the integral becomes:

L = ∫ [49, 2965] (1/2916)√u du

L = (1/2916) ∫ [49, 2965] √u du

To solve this integral, we can apply the power rule:

L = (1/2916) * (2/3) * u^(3/2) | [49, 2965]

L = (2/3)*(1/2916) * (2965^(3/2) - 49^(3/2))

Finally, we can calculate the exact length of the curve:

L = (2/3)*(1/2916) * (2965^(3/2) - 49^(3/2)) ≈ 128.47

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Answer:

perpendicular = x

Step-by-step explanation:

As we know that tan37= 3/4

            tan 37 = perpendicular/ base

   3/4 = x/8

   x = 3*8/4

     = 24/4

x = 6 cm

hope it helps

(a) Here is a sketch of the normal distribution for the weights of male Persian cats:

```

                   |

                   |

                   |

                   |

                   |

                   |

                   |     . . . . . . . . . . . . . . . . . . . . . .

                   |   .                                               .

                   | .                                                 .

                   |.                                                   .

--------------------|----------------------------------------------------

                μ-3σ           μ             μ+3σ

```

The x-axis represents the weights of the cats, and the y-axis represents the probability density. The curve is symmetric around the mean (μ) and has a standard deviation (σ) of 0.5 kg.

(b) To find the proportion of male Persian cats weighing between 5.5 kg and 6.5 kg, we need to calculate the area under the normal distribution curve between these two weights.

Using statistical software or tables for the normal distribution, we can find the corresponding z-scores for the weights 5.5 kg and 6.5 kg. Let's assume these z-scores are z1 and z2, respectively.

Then, we can find the proportion by subtracting the cumulative probability for z2 from the cumulative probability for z1. This represents the proportion of cats within the weight range.

(c) To determine the expected number of cats in the group that have a weight of less than 5.3 kg, we first need to find the z-score corresponding to this weight. Let's assume this z-score is z3.

Next, we calculate the cumulative probability for z3. This represents the proportion of cats in the population with a weight less than 5.3 kg.

To find the expected number of cats in the group, we multiply this proportion by the total number of cats in the group (80).

(d) To estimate the value of x for the statement "12 of the cats weigh more than x kg," we need to find the z-score corresponding to the cumulative probability of 12 cats in a group of 80.

Using statistical software or tables for the normal distribution, we can find the z-score that corresponds to this cumulative probability.

Then, we can convert the z-score back to the weight scale to estimate the value of x.

(e) To find the probability that exactly one cat out of ten weighs over 6.25 kg, we can use the binomial probability formula:

[tex]P(X = 1) = (nCk) * p^k * (1-p)^{(n-k)}[/tex]

In this case, n = 10 (number of cats chosen), k = 1 (number of cats weighing over 6.25 kg), and p represents the probability of a cat weighing over 6.25 kg, which can be calculated using the normal distribution and the corresponding z-score.

By substituting these values into the formula, we can calculate the probability.

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To compute the orthogonal projection of q onto the subspace spanned by p, we need to first find the projection vector. Let's call this projection vector v. We know that v must be orthogonal to the error vector e, where e is the difference between q and the projection of q onto the subspace spanned by p.

We can express v as a scalar multiple of p, so let's write v as v = ap, where a is a scalar. Then, using the inner product given by evaluation at −1, 0, and 1, we have:
=  =
Since we want v to be orthogonal to e, we need  to be 0. So, we have:
= 0
Expanding this out, we get:
2(6 - a) - 10/3(1 - a^2) = 0
Simplifying and solving for a, we get:
a = 3/5
So, v = 3/5p = 6/5t. Therefore, the orthogonal projection of q onto the subspace spanned by p is:
proj_p(q) = /||v||^2 * v = 9/5 - 18/5t

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fx(6, -6) = 1/12,fy(6, -6) = 1/12,f(6, -6) = -π/4,f'(6, -6) = 1/6;to find fx and fy, we need to take partial derivatives of the function f(x, y) = arctan(y/x) with respect to x and y, respectively.

Taking the partial derivative with respect to x (fx):
fx = -y / (x^2 + y^2)

Taking the partial derivative with respect to y (fy):
fy = x / (x^2 + y^2)

Now, let's evaluate fx, fy, f(6, -6), and f'(6, -6).

Substituting x = 6 and y = -6 into the expressions, we get:
fx(6, -6) = -(-6) / (6^2 + (-6)^2) = 6 / (36 + 36) = 6 / 72 = 1 / 12

fy(6, -6) = 6 / (6^2 + (-6)^2) = 6 / (36 + 36) = 6 / 72 = 1 / 12

f(6, -6) = arctan((-6) / 6) = arctan(-1) = -π/4

f'(6, -6) = fx(6, -6) + fy(6, -6) = 1/12 + 1/12 = 2/12 = 1/6

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Answer:

1

Step-by-step explanation:

x = ky², where k is a constant.

108 = k(3)² = 9k

k = 108/9 = 12.

x = ky²

12 = 12y²

y = 1

The Linear regression can be used to determine the relationship between absorbance and concentration by fitting a straight line equation to the data, with the slope representing the relationship between the two variables.

To determine the absorbance/concentration relationship, we need a dataset with corresponding absorbance and concentration values. By performing linear regression on this dataset, the resulting slope (m) will represent the relationship between absorbance and concentration.

Once we have the slope, we can express the absorbance (y) in terms of the concentration (x) using the equation:

y = mx

This equation allows us to calculate the absorbance for a given concentration of the dye, given the determined value of the slope (m).

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The statements that are  true about simple linear regression and correlation are Both i) and iii). option b is correct.

Which statements are true about simple linear regression and correlation?

Statement i) The least-squares regression line always goes through the point with coordinates [tex](\bar{X}, \bar{Y})[/tex]

Statement iii) The least-squares regression line minimizes the summation of residuals.

To determine the true statements, let's analyze each option:

i) The least-squares regression line always goes through the point with coordinates [tex](\bar{X}, \bar{Y})[/tex] : This statement is true. The least-squares regression line is calculated to pass through the point with the mean of the predictor variable [tex](\bar{X})[/tex] and the mean of the response variable [tex](\bar{Y})[/tex].

ii) If the correlation between response and predictor is greater than 0, then the slope of the least squares regression line is always positive: This statement is not necessarily true. The correlation between the response and predictor variable indicates the strength and direction of the linear relationship, but it doesn't determine the sign of the slope.

iii) The least-squares regression line minimizes the summation of residuals: This statement is true. The least-squares regression line is the line that minimizes the sum of the squared residuals, which are the differences between the observed and predicted values.

Based on the analysis, both statement i) and statement iii) are true.

Therefore, the answer is that both i) and iii) are true about simple linear regression and correlation, which is option b)

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There is no linear combination of the first two vectors that is as close as possible to [0, 0, 5].

To find the linear combination of the first two vectors that is as close as possible to the third vector [3, -1, 0], we need to find coefficients x and y such that the linear combination x*[i, 2, 1] + y*[2, 0, -1] is as close as possible to [3, -1, 0].

Let's set up the system of equations:

x*[i, 2, 1] + y*[2, 0, -1] = [3, -1, 0]

This system can be rewritten as:

x + 2y = 3

2x - y = -1

Solving this system of equations, we find x = 1 and y = 1. Therefore, the linear combination that is as close as possible to [3, -1, 0] is [i, 2, 1] + [2, 0, -1] = [3, 2, 0].

(b) To find the linear combination of the first two vectors that is as close as possible to the third vector [0, 0, 5], we set up the system of equations:

x*[1, 0, 1] + y*[0, 1, 1] = [0, 0, 5]

This system can be rewritten as:

x + y = 0

x + y = 0

x + y = 5

Since the third equation is inconsistent with the first two equations, there is no solution that satisfies all three equations. Therefore, there is no linear combination of the first two vectors that is as close as possible to [0, 0, 5].

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If the original coordinate given was (x,y), then the new coordinate after the transformation would be (x+5, 2y).

The question is asking for the new coordinate of a point on the graph of the function f(x) after it undergoes a transformation given by g(x) = 2f(x-5). The transformation involves a horizontal shift of 5 units to the right, followed by a vertical stretch by a factor of 2.

Let's say the original coordinate for f(c) is (c, f(c)). To find the new coordinate, we need to apply the transformation to this point.

First, we shift the point 5 units to the right to get (c+5, f(c)). Then, we apply the vertical stretch by multiplying the y-coordinate by 2, giving us the final point (c+5, 2f(c)).

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