Is x Is -2 and y is 4
Can someone help me please I didn’t realize this was the last question and it closes in some minutes I really need help please

To estimate the standard deviation of our  forecast, we'd  generally use cross-validation. Specifically, we'd divide the data into a training set and a  confirmation set.

We will fit the statistical  literacy  system on the training set and use it to make future forecasting on the  confirmation set. We'd calculate the mean squared error( MSE) of the forecast, which is the  normal of the squared differences between the future values and the  factual values.

Eventually, we'd take the square root of the MSE to  gain the estimated standard  divagation of our future prediction. This system allows us to assess the  delicacy of our model and estimate the  query of our  prediction.

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The statement "The empirical rule should be applied to data sets that are normally distributed or nearly normally distributed." is True.

The empirical rule, also referred to as the three-sigma rule or the 68-95-99.7 rule, is a quantitative rule which says that for a normally distributed, nearly all observed data will fall within three standard deviations (denoted by) of the mean or average (denoted by).

According to the Empirical Rule, 99.7% of data observed following a normal distribution is within 3 standard deviations of the mean.

According to this rule, 68% of the data is within one standard deviation of the mean, 95% is within two standard deviations, and 99.7% is within three standard deviations of the mean.

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0.1574 is the probability that more than half of the sampled students live on the campus.

It is well known that 45% of students at a large university live on campus. A random sample of 100 students will be chosen by the head of student life. The fixed value that offers the potential of the number of successful outcomes is the sample proportion. The sample proportion is an estimate of the population proportion's actual value.

100 samples are taken.

45 percent of students reside on campus.

The normal probability distribution is used to assess the likelihood that more than half of the sampled students live on campus.

[tex]P(p^{O} > 0.5)=P(\frac{p^{o}-p }{\sqrt{\frac{p(1-p)}{n} } } > \frac{0.5-0.45 }{\sqrt{\frac{0.45(1-0.45)}{100} } })[/tex]

=P(Z>1.00)

=0.1574 (Z- score table)

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A randomized experiment would be the best design for determining the relationship between cell phone use and brain cancer.

In a randomized experiment, individuals are randomly assigned to either a cell phone use group or a non-cell phone use group, and then the incidence of brain cancer is compared between the two groups.

This type of study can establish causality because it eliminates the possibility of confounding variables and ensures that any observed difference in brain cancer incidence is truly due to cell phone use and not some other factor.

Additionally, randomized experiments provide more robust results than observational studies, as they reduce the potential for selection bias and allow for control over extraneous variables.

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Answer:

80°

Step-by-step explanation:

180° - 100° = 80°

The solution is Option C.

The number of data points that are incorrectly marked on the scatter plot is 2 and they are G ( 5 , 5 ) , H ( 5 , 7 )

Dots are used in a scatter plot to show the values of two different numerical variables. Each dot's location on the horizontal and vertical axes represents a data point's values. To view relationships between variables, utilize scatter plots.

The closer the data points come to forming a straight line when plotted, the higher the correlation between the two variables, or the stronger the relationship. If the data points make a straight line going from near the origin out to high y-values, the variables are said to have a positive correlation.

Using end behavior, turning points, intercepts, and the Intermediate Value Theorem, plot the graph of a polynomial function.

Given data ,

Let the equation of graph be represented as A

Now , the value of A is

Let the values of x be = { 1 , 1 , 2 , 3 , 3 , 4 , 5 , 5 , 6 }

Let the values of y be = { 2 , 3 , 4 , 4 , 5 , 5 , 5 , 7 , 8 }

So , the points on the graph will be

A ( 1 , 2 ) , B ( 1 , 3 ) , C ( 2 , 4 ) , D ( 3 , 4 ) , E ( 3 , 5 ) , F ( 4 , 5 ) , G ( 5 , 5 ) , H ( 5 , 7 ) , I ( 6 , 8 )

The points G and H are marked incorrectly as ( 5 , 4 ) and ( 5 , 6 )

Hence , the graph is plotted and there are two incorrect data points on the scatter plot

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If the first equation is in format y=mx+b, (if not convert to it) the second equation would have the same m value, and any b value.

The same value indicates that they have the same slope, therefore parallel.

the expression x + (x - 5) can be used to determine how many apples Martin and Omar used in total. It helps us understand that Martin used more apples than Omar and that the number of apples in total is greater than 10.

a. Let x represent the number of apples that Martin used.

The expression is x + (x - 5).

b. We can substitute 10 for x in the expression to see if it is possible for Martin to have used 10 apples: 10 + (10 - 5). The answer is 15, which is greater than 10, so it is not possible for Martin to have used 10 apples.

Martin and Omar both used apples in their recipes, but Omar used 5 fewer apples than half as many as Martin used. To represent the number of apples that they used altogether, we can use an expression that includes a variable x, which represents the number of apples that Martin used. The expression is x + (x - 5). To check if Martin could have used 10 apples, we can substitute 10 for x in the expression: 10 + (10 - 5). The answer is 15, which is greater than 10, so it is not possible for Martin to have used 10 apples. Therefore, the expression x + (x - 5) can be used to determine how many apples Martin and Omar used in total. It helps us understand that Martin used more apples than Omar and that the number of apples in total is greater than 10.

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The cost of the soil for each seedling is $0.35.

Division is an arithmetic operation that is the reverse of multiplication. It is used to find the number of times a quantity is contained within another quantity. Division can be represented using the division symbol (÷) or a fraction bar (/) and is performed by dividing the dividend by the divisor. The result of division is the quotient, which represents the number of times the divisor fits into the dividend. For example, if you have 8 apples and you divide them into 4 equal parts, each part would contain 2 apples. The expression 8 ÷ 4 = 2 represents this division, where 8 is the dividend, 4 is the divisor, and 2 is the quotient.

First, we need to find out how many seedlings Lara can plant with the bag of soil she bought. To do this, we divide the total amount of soil by the amount of soil required for each seedling:

16.25 cups of soil ÷ 1.25 cups of soil per seedling = 13 seedlings

Next, we divide the total cost of the soil by the number of seedlings to find the cost of the soil per seedling:

$4.55 ÷ 13 seedlings = $0.35 per seedling.

Therefore, the cost of the soil for each seedling is $0.35.

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When we take a marble from the bag, the number of red marbles decreases by 1 and the total number of marbles decreases by 1 as well.

So after the first draw, the probability of getting a red marble on the second draw becomes 4/7 (since there are now 4 red marbles out of 7 total marbles).

To find the probability of getting 2 red marbles in a row, we multiply the individual probabilities of getting a red marble on each draw:

P(2 red marbles) = P(red marble on first draw) * P(red marble on second draw)

P(2 red marbles) = (5/8) * (4/7) = 20/56 = 5/14

So the probability of getting 2 red marbles in a row is 5/14.

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There are 16215 ways in which the top 3 cars can finish the race.

From the question, we have the following parameters that can be used in our computation:

People = 47

Positions = 3

The number of ways to select the top 3 cars from 47 cars is can be calculated using the following combination formula

C(n, r) = n!/(r! * (n - r)!)

Substitute the known values in the above equation, so, we have the following representation

C(47, 3) = 47! / (3! * (47-3)!)

Evaluate

C(47, 3) = 16215

So there are 16215 ways in which the top 3 cars can finish the race.

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Step 1: Calculate the total cost for the first hour. The total cost for the first hour is $2,000.

Step 2: Calculate the cost for each additional hour. The cost for each additional hour is $1,000.

Step 3: Calculate the total cost. To calculate the total cost, add the cost for the first hour ($2,000) to the cost for each additional hour ($1,000) multiplied by the number of additional hours (n). This gives us a total of P = 2,000 + 1,000(n + 1).

Therefore, the correct expression for the total cost is P = 2,000 + 1,000(n + 1).

C(x)=F+V is the generic form of the cost function formula (x) C(x) = F + V(x), where x is the number of units, V(x) is the total variable cost, and C(x) is the overall cost of production.

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Answer:

Step-by-step explanation:

To find the length of Oak Road from Main Street to the intersection of Highway 33, we can set up a proportion using the information that the triangle formed by the intersections of Oak Road, Main Street, and Highway 33 is similar to triangle ABC. Let's call the length of Oak Road x.

Using the information that the section of Main Street between Oak Road and Highway 33 is eight miles long, we can write:

x / 8 = 8 / x

Cross-multiplying gives us:

8x = 64

Finally, solving for x, we get:

x = 8

So the length of Oak Road from Main Street to the intersection of Highway 33 is 8 miles, rounded to the nearest tenth.

Answer:

3cm.

Step-by-step explanation:

As you know, a diameter is the same as twice a radius.

AO= OC.

OC= 2.5cm.

therefore, AC= OA+OC

AC= 2.5+2.5

AC= 5cm.

AB= 4cm.

Using Pythagorean theorem.

BC= √(AC²-AB²).

BC= √(5²-4²)

BC= √(25-16)

BC= √9

BC= 3cm.

The per cent of 32 out of 80 will be 40% out of 80.

To translate this per cent problem, we can establish up a ratio table and use cross-multiplication to calculate the answer.

32 is x% out of 80

Set up the ratio table:

32 x%

-- = ---

80 100%

Now, cross-multiply to solve for x:

32 × 100 = x% × 80

3200 = 80x

Now, divide both sides by 80 to calculate x:

3200 / 80 = 80x / 80

40 = x

So, the answer is 40%. Therefore, 32 out of 80 is 40% out of 80.

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The sale price of each pen if 10 pens are purchased at the rate of Rs 12.30 each and there is a total gain of Rs 24 is Rs 14.70

Total number of pens = 10

Cost of each pen = Rs 12.30

Total gain = Rs 24

Gain on each pen = Total gain / Total number of pens

= Rs 24 / 10

= Rs 2.4

The sale price of each pen = Cost of each pen + Gain on each pen

= Rs 12.30 + Rs 2.4

= Rs 14.70

Hence, each pen is sold at Rs 14.70

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3/15

1/3 of 3/5 is the same as multiplying

if it were only 1 acre it would look like 1/3 x 1 so for 3/5 of an acre, it is

(1/3) x (3/5)

remember, multiplying fractions is numerator to numerator, and denominator to denominator.

so (1/3) x (3/5) = 3/15

We would expect smaller standard errors for beta parameters as the sample size increases because we have more information to work with. This would result in more accurate estimates for the beta parameters.

Increasing the sample size when estimating a simple linear regression model will not have any effect on the beta parameter estimates. However, it will have an effect on the standard errors of the beta parameters. With a larger sample size, we have more information to work with, and therefore can more accurately estimate the beta parameters. As a result, the standard errors for the beta parameters will decrease as the sample size increases. This means that we can be more confident in our estimates of the beta parameters as the sample size increases.

The complete question: Intuitively, what do we expect to have when the sample size increases when we estimate a simple linear regression model?

a. Increase in sample size does not have any effect on beta parameter estimates or standard errors

b. We would expect larger standard errors for beta parameters because we have more information.

c. Beta parameter estimates get smaller

d. We would expect smaller standard errors for beta parameters because we have more information .

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Answer:

(a)=1/4,(b)=1/512

Step-by-step explanation:

(a) The two dice each have four possible outcomes, and the total number of possible outcomes when the two dice are thrown is 4 x 4 = 16. To determine the most likely total score, we need to find the sum that has the highest probability of occurring.

To do this, we can create a table that shows all the possible outcomes and their corresponding probabilities:

Dice 1 Dice 2 Total Probability

1 1 2 1/16

1 2 3 1/8

1 3 4 1/16

1 4 5 1/8

2 1 3 1/8

2 2 4 1/16

2 3 5 1/8

2 4 6 1/16

3 1 4 1/16

3 2 5 1/8

3 3 6 1/16

3 4 7 1/8

4 1 5 1/8

4 2 6 1/16

4 3 7 1/8

4 4 8 1/16

From the table, we can see that the most likely total score is 5, which occurs with a probability of 1/8 + 1/8 = 1/4.

(b) The probability of obtaining a specific score on three successive throws is the product of the probabilities of obtaining that score on each throw, assuming that the dice are fair and independent. The most likely total score is 5, so we will calculate the probability of obtaining a total score of 5 on each throw and then multiply the probabilities together.

The probability of obtaining a total score of 5 on one throw is 1/8, as we can see from the table above. Therefore, the probability of obtaining a total score of 5 on three successive throws is (1/8) x (1/8) x (1/8) = 1/512.

Answer:

No, it is not a solution

Step-by-step explanation:

2x + y = 5

x - y = -2

Is (-1, -1) the solution of the system equations?

Let's check my putting the number in and see if it is true!

2(-1) - 1 = 5

-2 - 1 = 5

-3 = 5

So, (-1, -1) is not the solution.

The total weight of the four babies is given as follows:

28 lbs.

The total weight is obtained applying the proportions in the context of the problem.

The weights for each baby are given as follows:

Combining the four weights, the total weight of the four babies is given as follows:

7.25 + 6.75 + 5.875 + 8.125 = 28 lbs.

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There must be a whole number of sheep, we round to 16. Sara the farmer therefore owns 16 sheep.

The number of sheep is x, let's say. As a result, x + 14 equals the number of chickens.

The sum of the legs on the chickens and sheep is 94; hence, the number of sheep legs plus the number of chicken legs equals 94.

Write this as follows:

2x + 2(x + 14) = 94

The equation is expanded and made simpler to give us:

4x + 28 = 94

Subtracting 28 from both sides gives us:

4x = 66

Finally, dividing both sides by 4 gives us:

x = 16.5

Since there must be a whole number of sheep, we round to 16. Sara the farmer therefore owns 16 sheep.

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The expression for output is 6 greater than three times the input is y = 3x + 6.

Expression in maths is defined as the collection of numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.

Given that the output is 6 greater than three times the input the expression can be written as:-

y = 3x + 6

Therefore, y = 3x + 6 is an expression for an output that is six times greater than the input.

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To gain 10% profit, the shopkeeper must offer a 8.33% discount on the market price.

Profit is the difference between the total revenue and total cost of a business. It is an important measure of the success of a business, as it shows how much money the business is making from its operations. Profit is usually expressed as a percentage of the total revenue. It is also known as "net income" or "net profit" and is the amount of money left over after all expenses, including taxes, have been paid. Profit is important because it allows a business to reinvest in itself, expand, and grow. It can also be used to pay dividends to shareholders, increase wages, and cover other expenses.

To gain 10% profit, the shopkeeper must offer a 8.33% discount on the market price. This is because if the shopkeeper was gaining 20% before, a 10% discount would reduce the profit he is making to 10%.

Lets 20% gain = $20

Then market price be = 120/100 = $120

10% gain = $110

Discount = $120 -  $110

               = $10

Discount % = 10/120

                  = 0.083

                  = 8.33%

Thus, To gain 10% profit, the shopkeeper must offer a 8.33% discount on the market price.

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Objective:- To prove for the vertical angles  ∠2 and ∠4,   m∠2=m∠4

An angle is a mathematical term, which we can define, when two straight lines or rays meet at a common endpoint. The common point is called the vertex of an angle. The word angle comes from a Latin word named ‘angulus,’.

Interior angles:- The inner angle made by the intersection of two polygonal sides.

Exterior angles:- The outer angle made by the intersection of two polygonal sides.

Explanation:-

∠1and∠2

form a linear pair,

so by the Supplement Postulate, it can be state that,

they are supplementary.

That is,     m∠1+m∠2=180°

∠2 and ∠3

form a linear pair also, so

m∠2+m∠3=180°

Subtracting m∠2

from both sides of both equations, we get

m∠1=180°−m∠2=m∠3

Therefore,

∠1 ≅ ∠3

You can use a similar argument to prove that ∠2 ≅  ∠4

Hence Proved.

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Answer:

-2

Step-by-step explanation:

3x-1=-7

3x=-7+1

3x=-6

X=-6/3

X=-2

Answer:

-2

(sorry if it's blurry)

Hope it helps.....

Answer:

c

Step-by-step explanation:

Let's find the value of 'y' that makes this true

2y + 5 = 9     subtract 5 from both ides of the equation

2y + 5 - 5 = 9 -5

2y = 4       Now divide both sides by 2

y = 2  

The equation to find the amount that Lamia has saved would be 25 + 3x = 225

Lamia's aunt will add $ 25 to the amount saved by Lamia and then will give her three times the amount she has saved. Assuming this amount saved is x, the equation would be:

Total given to Lamia = 25  + ( 3 x Amount saved )

225 = 25 + ( 3 x)

25 + 3x = 225

25 + 3x = 225

This means that the amount that Lamia saved was :

25 + 3x = 225

3 x = 225 - 25

x = 200 / 3

x = $ 66. 70

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The slope of graph one is 3 / 2 and the second graph is -1.

A line's slope is defined as the change in y coordinates with respect to the change in x coordinates. The net y coordinate change is y, while the net x coordinate change is x. As a result, the change in y coordinate in relation to the change in the x coordinate can be written as m = y/x.

The slope of the first graph is calculated as:-

Slope = rise/run

Slope = 3 / 2

The slope of the second graph is calculated as:-

Slope = ( 0 - 3 ) / ( 3 - 0 )

Slope = -1

Therefore, the slope of graph one is 3 / 2, while the slope of graph two is -1.

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The slopes are:

2) -1

3) 2/3

The equation of a line is given by:

y = mx + c

where m is the slope of the line and c is the y-intercept.

Example:

The slope of the line y = 2x + 3 is 2.

The slope of a line that passes through (1, 2) and (2, 3) is 1.

We have,

Pick two points from the graph.

2)

(2, 1) and (-2, 5)

Slope = m

m = (5 - 1) / (-2 - 2)

m = 4 / -4

m = -1

3)

(0, 0) and (3, 2)

Slope = m

m = (2 - 0) / (3 - 0)

m = 2/3

Thus,

The slope is -1 and 2/3.

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