Answer:
63 miles/1.4 hours = 45 mph
(55 mph)(4 hours) = 220 miles
Is it true that If two rows of a 3×3 matrix A are the same, then detA = 0.
If two rows of a 3×3 matrix A are the same, then detA = 0.
True, consider a 3 × 3 matrix A with two identical rows.
The determinant of a matrix is a scalar value that encodes various properties of the matrix.
One property of the determinant is that it changes sign if two rows (or two columns) of the matrix are interchanged.
Another property is that if two rows (or two columns) of the matrix are the same, then the determinant is zero.
Without loss of generality, assume that the first and second rows of A are the same.
Interchange the first and third rows of A using an elementary row operation without changing the value of the determinant, since this operation changes the sign of the determinant.
Then, we obtain a matrix B of the form:
[ a11 a12 a13 ]
[ a11 a12 a13 ]
[ a31 a32 a33 ]
Now, we can expand the determinant of B along the first column to get:
det(B) = a11 × det(B11) - a31 × det(B31)
B11 and B31 are the 2x2 matrices obtained by deleting the first row and the first column, and the third row and the first column of B, respectively.
Since the first and second rows of B are identical, we have det(B11) = 0. Hence, we obtain:
det(B) = a11 × det(B11) - a31 × det(B31) = -a31 × det(B31)
Now, we can expand the determinant of B31 along its first column to get:
det(B31) = a12 × a33 - a32 × a13
Substituting this into the previous expression, we obtain:
det(B) = -a31 × det(B31) = -a31 × (a12 × a33 - a32 × a13)
This shows that the determinant of A is zero, since det(A) = det(B) by elementary row operations.
If two rows of a 3 × 3 matrix A are the same, then detA = 0.
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For what values of a and m does f(x) have a horizontal asymptote at y = 2 and a vertical asymptote at x = 1?
f (x) = StartFraction 2 x Superscript m Baseline Over x + a EndFraction
a = –1, m = 0
a = 1, m = 0
a = –1, m = 1
a = 1, m = 1
For a = 1 and m = 1 does f(x) have a horizontal asymptote at y = 2 and a vertical asymptote at x = 1.
To find the values of a and m that give the function f(x) a horizontal asymptote at y = 2 and a vertical asymptote at x = 1, we need to analyze the behavior of the function as x approaches 1 and as x goes to infinity.
When x approaches 1 from the left and right sides, the denominator of f(x) approaches 0, so there is a vertical asymptote at x = 1. To have a vertical asymptote at x = 1, the numerator of f(x) cannot approach 0 as x approaches 1, so m must be greater than or equal to 1.
When x goes to infinity or negative infinity, the function f(x) approaches 2, which means there is a horizontal asymptote at y = 2. To have a horizontal asymptote at y = 2, the degree of the numerator must be equal to or less than the degree of the denominator. The degree of the numerator is m, and the degree of the denominator is 1.
So, the values of a and m that give f(x) a horizontal asymptote at y = 2 and a vertical asymptote at x = 1 are:
a = 1, m = 1
Substituting a = 1 and m = 1 into f(x), we get:
f(x) = 2x/(x+1)
which has a vertical asymptote at x = 1 and a horizontal asymptote at y = 2.
Therefore, the answer is a = 1, m = 1. The other values of a and m do not give a vertical asymptote at x = 1 and/or a horizontal asymptote at y = 2.
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Answer:
CCCCCCCC
Step-by-step explanation:
Edg 2023
find the force on a square loop (side a), lying in the yz plane and centered at the origin, if it carries a current i, flowing counterclockwise, when you look down the x axis.
The force on the square loop is F = i(a²)(B), where B is the strength of the magnetic field in the x direction.
What is the Current-carrying loop?A current-carrying loop refers to a closed circuit consisting of a conductor (usually a wire) bent into the shape of a closed loop, through which an electric current flows. The loop may be any shape or size, but its geometry and the amount of current flowing through it determine the magnetic field it produces.
When a current-carrying loop is placed in a magnetic field, a force is exerted on the loop due to the interaction between the magnetic field and the current. The force on the loop can be calculated using the following formula:
=> F = iABsinθ
where F is the force on the loop, i is the current flowing through the loop, A is the area of the loop, B is the magnetic field, and θ is the angle between the normal to the loop and the direction of the magnetic field.
In this case, the loop is in the yz plane and centered at the origin. The magnetic field is assumed to be in the x direction. Since the loop is perpendicular to the x direction, the angle between the normal to the loop and the magnetic field is 90 degrees.
The area of the loop is given by A = a².
The current flowing through the loop is i.
Thus, the force on the loop is given by:
F = iABsinθ = i(a^2)(B)(sin90) = i(a^2)(B)
Therefore, the force on the square loop is F = i(a^2)(B), where B is the strength of the magnetic field in the x direction.
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A survey question asked of unmarried men was, "What is the most important feature you consider when deciding to date somebody?". The results were found to depend on whether the interviewer was male or female. This is an example of
This is an example of interviewer bias where the gender of the interviewer may have impacted the replies of the unmarried males in the poll.
This is an example of interviewer bias, where the gender of the interviewer may have influenced the responses of the unmarried men in the survey. The results may not accurately reflect the true opinions of the participants as their answers could have been affected by their desire to impress or please the interviewer.
This situation is an example of response bias, specifically interviewer bias, which occurs when the respondent's answer is influenced by the gender or characteristics of the interviewer, rather than their true preferences or opinions.
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another chool is also cosidering changing thier pizza vendor. the school selects seperate random samples of 50 freshman, 50 sophiomres, 50 jjuniors, and 50 seniors. each student tries
If another school is considering changing their pizza vendor, they may also select separate random samples of 50 freshmen, 50 sophomores, 50 juniors, and 50 seniors to gather feedback from the students. By doing so, they can obtain a representative sample of the entire student population and ensure that each grade level is equally represented.
This will provide valuable insight into the preferences and opinions of the students, allowing the school to make an informed decision on which pizza vendor to choose. It is important to consider the feedback of all students in the decision-making process to ensure that the majority of the student body is satisfied with the food options provided by the school.
Step 1: Select random samples of students from each grade level.
Step 2: Provide the new pizza to each student in the samples.
Step 3: Ask the students to evaluate the pizza based on taste and quality.
Step 4: Collect the feedback from all 200 students.
Step 5: Analyze the data to determine if the majority of students prefer the new pizza vendor.
Based on the analysis, the school can make an informed decision about whether to change their pizza vendor or not.
another school is also cosidering changing thier pizza vendor. the school selects seperate random samples of 50 freshman, 50 sophiomres, 50 jjuniors, and 50 seniors. each student tries
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Macy makes a fruit punch by mixing green apple juice and carrot juice.
For every 2
cups of carrot juice, she uses 4
cups of green apple juice.
The unit rate of the juice is 0.5 carrot juice per green apple juice
Calculating the unit rates of the juiceFrom the question, we have the following parameters that can be used in our computation:
For every 2 cups of carrot juice,She uses 4 cups of green apple juice.This means that
Carrot juice = 2
Green apple juice = 4
Using the above as a guide, we have the following:
Unit rate = Carrot juice/Green apple juice
Substitute the known values in the above equation, so, we have the following representation
Unit rate = 2/4
Evaluate
Unit rate = 0.5
Hence, the unit rate is 0.5 carrot juice per green apple juice
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The probability is p = 0.80 that a patient with a certain disease will be successfully treated with a new medical treatment. Suppose that the treatment is used on 40 patients. What is the standard deviation of the number of patients who are successfully treated?
The standard deviation of the number of patients who are successfully treated is approximately 2.53.
To find the standard deviation of the number of patients who are successfully treated, we need to use the formula for the standard deviation of a binomial distribution:
σ = √(np(1-p))
where σ is the standard deviation, n is the number of trials, p is the probability of success on a single trial.
In this case, n = 40 (the number of patients) and p = 0.80 (the probability of success). So we can plug these values into the formula:
σ = √(40 x 0.80 x (1 - 0.80))
= √(40 x 0.80 x 0.20)
= √(6.4)
= 2.53
Therefore, the standard deviation of the number of patients who are successfully treated is 2.53.
To find the standard deviation of the number of patients who are successfully treated, we need to use the binomial distribution formula, where n is the number of trials (patients), and p is the probability of success (successful treatment).
In this case, n = 40 and p = 0.80. The formula for the standard deviation (σ) of a binomial distribution is:
σ = √(n × p × (1 - p))
Plugging in the values, we get:
σ = √(40 × 0.80 × (1 - 0.80))
σ = √(40 × 0.80 × 0.20)
σ = √(6.4)
Therefore, the standard deviation of the number of patients who are successfully treated is approximately 2.53.
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According to a candy​ company, packages of a certain candy contain 30​% orange candies. Find the approximate probability that the random sample of 50 will contain 38​% or more orange candies.
The approximate probability that the random sample of 50 will contain 38% or more orange candies is 0.966 or about 96.6%.
The number of orange candies in a sample of 50 candies as a binomial random variable with n = 50 and p = 0.30, p is the probability of selecting an orange candy.
The probability that the sample contains 38% or more orange candies, we need to calculate the cumulative probability of the binomial distribution from x = 0 to x = 19, and subtract it from 1.
Here, x is the number of orange candies in the sample, and 19 is the largest integer less than or equal to 0.38 × 50=19.
Using a binomial calculator or software, we can find that the cumulative probability of the binomial distribution from x = 0 to x = 19 is approximately 0.034.
The probability that the sample contains 38% or more orange candies is approximately:
1 - 0.034 = 0.966
The approximate probability that the random sample of 50 will contain 38% or more orange candies is 0.966 or about 96.6%.
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7) What is most likely to happen to the job market in a weak economy?
Question 7 options:
The unemployment rate rises, and companies go out of business or lay off employees due to insufficient profits.
The unemployment rate decreases because people have no money and want to take any job.
Businesses usually hire more people to help make the economy strong and people have more money to spend on luxuries.
Employment rates rise and employers have more people to choose from when they need to hire new employees.
The most likely to happen to "job-market" in a weak economy is (a) The unemployment rate rises, and companies go out of business or "lay-off" employees due to insufficient profits.
In a weak economy, the companies experience a decrease in their sales and revenue, which leads to financial difficulties. So, in an attempt to reduce costs and remain profitable, the companies "lay-off" employees or go out of business, resulting in an increase in the unemployment rate.
The weak economy also means that there are fewer job opportunities available, which make it harder for people who are unemployed to find work. So, a weak economy generally has a negative impact on the job market.
Therefore, the correct option is (a).
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The given question is incomplete, the complete question is
What is most likely to happen to the job market in a weak economy?
(a) The unemployment rate rises, and companies go out of business or lay off employees due to insufficient profits.
(b) The unemployment rate decreases because people have no money and want to take any job.
(c) Businesses usually hire more people to help make the economy strong and people have more money to spend on luxuries.
(d) Employment rates rise and employers have more people to choose from when they need to hire new employees.
in the case of jenny's test scores even though 86 on the statistics test was higher than the 82 on the english test, her z scores for these were .99 and 1.5 respectively, so she actually performed .... relative to her classes on the english test
Based on these z-scores, we can say that Jenny performed better relative to her classmates on the English test than the statistics test, despite the lower numerical score.
Jenny's performance on her statistics and English tests based on the given z-scores.
Let me explain the concept of z-scores and how they can be used to interpret her performance.
Z-scores are a measure of how many standard deviations a data point is from the mean of a distribution.
Jenny's z-scores tell us how far her test scores are from the average scores of her classmates in each subject.
Jenny's statistics test score is 86, with a z-score of 0.99.
Her English test score is 82, with a z-score of 1.5.
A z-score of 1.5 indicates that her English test score is 1.5 standard deviations above the mean of her English class, A z-score of 0.99 indicates that her statistics test score is 0.99 standard deviations above the mean of her statistics class.
A higher z-score means that her performance in that subject is further above the class average.
Even though Jenny scored 86 on her statistics test and 82 on her English test, she actually performed better relative to her classmates on the English test.
This is because her English test z-score (1.5) is higher than her statistics test z-score (0.99), indicating a better performance in English compared to her peers.
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Paul is purchasing tickets to a play. The total cost, C, of purchasing n tickets can be found using the equation C = 12.25n + 3.75. Which statements are true?
(A) Each ticket costs $3.75.
(B) Each ticket costs $12.25.
(C) The one-time processing fee costs $3.75.
(D) The one-time processing fee costs $12.25.
The true statements are:
Each ticket costs $12.25. (option b)
The one-time processing fee costs $3.75. (option c)
What are the true statements?A linear equation is an equation with a single variable raised to the power of one.
y = mx + c
m = variable cost
c = fixed cost
Fixed cost is a cost that remains constant regardless of the number of tickets bought. Variable cost is a cost that changes with the number of tickets bought.
C = 12.25n + 3.75
Where:
12.25 - variable cost - cost of each ticket. This cost increases with the number of tickets that is purchased. As more tickets are purchased, the cost increases by 12.25.
3.75 - fixed cost - one time online processing fee. This is because this payment is made once and it does not increase with the number of tickets bought.
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recall that in -fold cross-validation, one th of the data is reserved for testing. while in leave-one-out cross-validation, only a single data point is reserved for testing.let us define the bias of the cross-validation procedure as the mean of the difference between the actual performance of the model, and the performance estimated using the cross-validation procedure. which method will generally produce an estimate with higher bias?leave-one-out-fold
K-fold cross-validation generally produces an estimate with lower bias compared to leave-one-out cross-validation.(option b).
Cross-validation is a popular technique used in machine learning to estimate the performance of a model on unseen data. There are different methods of cross-validation, including leave-one-out and K-fold. In leave-one-out, only one data point is left out for testing, while in K-fold, a Kth portion of the data is held out.
Now, to answer the question of which method generally produces an estimate with higher bias, we need to look at the formula for bias in cross-validation. The bias is given by the difference between the expected value of the cross-validation estimate and the true performance of the model.
For K-fold cross-validation, the expected value of the estimate is computed as the average of the estimates obtained in each of the K folds. This means that the bias is dependent on the number of folds used. The more folds used, the lower the bias is likely to be.
Hence the correct option is (b).
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A band estimates that 3/10 of people on its mailing list has seen the band play exactly once, and 9/20 of people on its mailing list have seen the band play more than once. What fraction of
people on the band’s mailing list have seen the band play at least once?
The fraction of people on the band's mailing list who have seen the band play at least once is 3/4.
To find the fraction of people who have seen the band play at least once, we need to add the fraction of people who have seen the band exactly once to the fraction of people who have seen the band more than once.
Fraction of people who have seen the band exactly once = 3/10
Fraction of people who have seen the band more than once = 9/20
To find the fraction of people who have seen the band play at least once, we need to add these two fractions
Fraction of people who have seen the band at least once = 3/10 + 9/20
We need to find a common denominator to add these two fractions. The common denominator of 10 and 20 is 20.
Fraction of people who have seen the band at least once = (3/10) * (2/2) + (9/20) * (1/1)
= 6/20 + 9/20
= 15/20
= 3/4
Therefore, 3/4 of the people on the band's mailing list have seen the band play at least once.
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IS ABC = DEF IF SO , NAME THE CONGRUENCE POSTULATE THAT APPLIES .
The congruence postulate that applies is C. Congruent - SSS
What are congruent triangles?When the properties (i.e length of sides and/or internal angles) of two or more triangles are equal, then it can be said that they are congruent. This congruent relations can be expressed using either of the following postulates: Angle-Side-Side, Side-Angle-Side (SAS), Angle-Angle-Side (AAS), Side-Side-Side (SSS) etc.
Considering the given triangles ABC and DEF, it is was given that:
AB ≅ DE
BC ≅ EF
CA ≅ FD
Therefore, it can be concluded that the two triangles are congruent by Side-Side-Side (SSS) relations. So that the required congruence postulate that applies is C. Congruent - SSS
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What is the area of the figure below?
I don't remember how to fid area of something like this.
The area of the figure below is 58 in².
What is area?
Area is the region bounded by a plane shape.
To calculate the area of the figure, we use the formula below
Formula:
A = BH/2+L(a+b)/2+bh/2Where:
A = Area of the figureB = 8 inH = 6 inL = 5 ina = 4 inb = 6 inh = 3 inSubstitute these values into equation 1
A = (8×6)/2+5(4+6)/2+6×3/2A = 24+25+9A = 58 in²Learn more about area here: https://brainly.com/question/25092270
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Identify the segment bisector of QR. Then find QR. *
The segment bisector of QR is Ml.
The length of QR is equal to 32 units.
How to determine the midpoint of a line segment?In Mathematics, the midpoint of a line segment with two end points can be determined or calculated by adding each end point on a line segment together and then divide by two (2).
Since Ml is the midpoint and segment bisector of line segment QR, we have the following:
Line segment QM = Line segment MR
2x + 6 = 5x - 9
5x - 2x = 9 + 6
3x = 15
x = 15/3
x = 5.
Now, we can determine line segment QR as follows:
QM = 2x + 6 = 2(5) + 6 = 16 units.
MR = 5x - 9 = 5(5) - 9 = 16 units.
QR = QM + MR
QR = 16 + 16
QR = 32 units.
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Missing information:
The question is incomplete and the complete question is shown in the attached picture.
How many non-isomorphic simple graphs are there on n vertices when n is 2? 3? 4? and 5?
There will be 1, 2, 6, 21 non-isomorphic simple graphs for 2, 3, 4 and 5 vertices.
What are non-isomorphic simple graphs?
A non-isomorphic simple graph is a graph that is distinct from another graph, even if the two graphs have the same number of vertices and edges, and the same connectivity pattern. In other words, two graphs are non-isomorphic if they cannot be transformed into each other by a relabeling of their vertices.
For a small number of vertices, we can enumerate all non-isomorphic simple graphs by hand.
For n = 2, there is only one possible graph, which is the edge connecting the two vertices.
For n = 3, there are only two possible graphs: a triangle (complete graph on 3 vertices) and a single edge with an isolated vertex.
For n = 4, there are six possible graphs:
Complete graph on 4 vertices
Cycle graph on 4 vertices
Complete bipartite graph K2,2
Graph with a central vertex adjacent to all other vertices
Graph with two vertices of degree 3 and two vertices of degree 1
Graph with one vertex of degree 3 and three vertices of degree 1
For n = 5, there are 21 possible graphs, which can be generated by adding edges to the graphs for n = 4.
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Solve the system by substitution.
y = -8x – 49
y = -x
Answer: x=-7 y=7
Step-by-step explanation:
a population numbers 1,872 organisms initially and increases by 1.6% each year. suppose p represents population, and t the number of years of growth. write an exponential model to represent this situation.
The exponential model for this situation is: P(t) = 1,872(1 + 0.016)^t
To write an exponential model representing the given situation, we'll use the formula: P(t) = P₀(1 + r)^t, where P(t) is the population at time t, P₀ is the initial population, r is the growth rate, and t is the number of years.
Where p is the population at any given year t, 1,872 is the initial population, and 1.6% increase is represented by multiplying 1.016 to the power of t. This model assumes continuous and unrestricted growth of the population.
So, the exponential model for this situation is:
P(t) = 1,872(1 + 0.016)^t
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The triangle on the right is a scaled copy of the triangle on the left. Identify the scale factor. Express your answer as a whole number or fraction in simplest form.
First triangle
15
15
second triangle
45/2
45/2
Answer: 3
Step-by-step explanation:
The scale factor is the ratio of corresponding side lengths of the two triangles.
In the given triangles, the length of the corresponding sides of the triangles are:
For the first triangle:
Side A = 15 units
Side B = 15 units
For the second triangle:
Side A = 45/2 units
Side B = 45/2 units
To find the scale factor, we can divide the length of one side of the second triangle by the corresponding length of the first triangle.
For example, we can use Side A:
Scale factor = (length of Side A of the second triangle) / (length of Side A of the first triangle)
Scale factor = (45/2) / 15
Scale factor = (45/2) * (1/15)
Scale factor = 3/2
Since the two triangles are scaled copies of each other, the scale factor should be the same for all corresponding sides.
Thus, the scale factor is 3 (in simplest form).
how do you determine the percent of scores in the data table that fall within one standard deviation of the mean?
30% of the scores in the dataset fall within one standard deviation of the mean.
To determine the percent of scores in a data table that fall within one standard deviation of the mean, you need to follow these steps:
Calculate the mean and standard deviation of the dataset.
Determine the lower and upper bounds of one standard deviation by subtracting the standard deviation from the mean to get the lower bound, and adding the standard deviation to the mean to get the upper bound.
Count the number of data points in the dataset that fall within the lower and upper bounds of one standard deviation.
Divide the number of data points within one standard deviation by the total number of data points in the dataset, and multiply the result by 100 to get the percentage of scores that fall within one standard deviation of the mean.
Let's say you have a dataset with a mean of 50 and a standard deviation of 10.
To determine the percent of scores that fall within one standard deviation of the mean, you would calculate the lower and upper bounds of one standard deviation as follows:
Lower Bound = 50 - 10 = 40
Upper Bound = 50 + 10 = 60
The number of data points in the dataset that fall within the lower and upper bounds of one standard deviation.
Let's say there are 30 data points that fall within this range.
The number of data points within one standard deviation by the total number of data points in the dataset, and multiply the result by 100 to get the percentage of scores that fall within one standard deviation of the mean:
Percent Within One Standard Deviation
= (30/100) × 100 = 30%
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People who are underweight can increase their caloric intakes by choosing nutrient- and energy-dense foods. Consider the following foods and classify each into the appropriate category
Some examples of nutrient- and energy-dense foods that can be beneficial for people who are underweight are nuts and nut butters, Avocado, whole eggs, Full Fat Dairy, Fatty Fish, Dried Fruit, Whole grain bread and pasta, olive oil, sweet potatoes.
Nuts are high in healthy fats, protein, and calories, making them an excellent choice for people who are underweight. Nut butters, such as almond butter, peanut butter, and cashew butter, are also good options.
Avocado is high in healthy fats, fiber, and calories, making it a great choice for adding extra nutrients and calories to meals.
Whole eggs are a good source of protein, healthy fats, and calories, making them a nutrient-dense food that can help with weight gain.
Full-fat dairy products, such as whole milk, cheese, and yogurt, are high in calories and protein, making them a good choice for people who are underweight.
Fatty fish, such as salmon, tuna, and mackerel, are high in protein and healthy fats, making them an excellent choice for weight gain.
Dried fruit is a concentrated source of calories and nutrients, making it a good option for adding extra energy to meals or as a snack.
Whole-grain bread and pasta are higher in nutrients and fiber than their white counterparts and can help increase caloric intake.
Olive oil is high in healthy fats and calories, making it a good choice for adding flavor and nutrition to meals.
Sweet potatoes are a nutrient-dense carbohydrate source that can provide additional calories and nutrients to meals.
Overall, choosing nutrient- and energy-dense foods can be an effective way for people who are underweight to increase their caloric intake and promote healthy weight gain.
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-- The given question is incomplete, the complete question is
"Give some examples of nutrient- and energy-dense foods that can be beneficial for people who are underweight." --
A triangle ABC has a perimeter of 1.95 m.
AB is twice the length of AC and 10 cm longer than BC. Find the length of AB.
The length of AB is 10m.
Let's assume that the length of AC = x,
According to the problem statement, AB= 2x ...........(1)
Also, BC is 10 cm shorter than AB, so,
BC=AB-10 .......(2)
The perimeter of the triangle is the sum of its three sides:
therefore,
1.95=AB+AC+BC
We can put the value from eq(1) & eq(2)
1.95=2x+x+(AB-10)
AB= 3x+8.05............... (3)
Now, we need to find the value of x
1.95= 2x+x+(AB-10)
or, 1.95 = 3x+ AB-10
Adding 10 to both sides
11.95 = 3x+AB.......(4)
Substituting the expression, we found for AB:
11.95=3x+3x=8.05
11.95= 6x
x= 0.65
So, the value of AB is
AB = 3x+8.05
AB = 3(0.65)+8.05
AB = 10 m
Therefore, The length of AB is 10m.
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a psychologist is studying the self image of smokers, which she measures by the self-image (si) score from a personality inventory. she would like to estimate the mean si score, , for the population of all smokers. she plans to take a random sample of si scores for smokers and estimate via this sample. assuming that the standard deviation of si scores for the population of all smokers is , what is the minimum sample size needed for the psychologist to be confident that her estimate is within of ? carry your intermediate computations to at least three decimal places. write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
To calculate the minimum sample size needed, we can use the formula: n = (z * σ / E)^2
Where:
z = the z-score associated with the desired level of confidence (let's assume 95% confidence, so z = 1.96)
σ = the standard deviation of the population (given in the problem statement)
E = the maximum error margin (given in the problem statement)
Plugging in the values, we get:
n = (1.96 * σ / E)^2
To determine the value of σ/E, we need more information. Let's assume that the maximum error margin E is 0.5, which means that the psychologist wants to be within 0.5 points of the true population mean si score.
Now, let's say that σ = 10 (just as an example). Then, σ/E = 10/0.5 = 20.
Plugging this into the formula, we get:
n = (1.96 * 10 / 0.5)^2 = 384.16
Rounding up to the nearest whole number, the minimum sample size needed is 385.
Therefore, the psychologist would need to take a random sample of at least 385 si scores from smokers to be confident that her estimate of the population mean si score is within 0.5 points.
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find the standard deviation. the top nine scores on the organic chemistry midterm are as follows. 80, 30, 34, 32, 55, 27, 38, 41, 84
Answer:
Approximately 20.33 (rounded to two decimal places)
Step-by-step explanation:
To find the standard deviation, we will first find the mean (average) of the scores, then find the variance, and finally take the square root of the variance to get the standard deviation.
Calculate the mean:
(80 + 30 + 34 + 32 + 55 + 27 + 38 + 41 + 84) / 9 = 421 / 9 = 46.78 (rounded to two decimal places)
Calculate the variance:
a. Find the difference between each score and the mean, and then square the differences (rounded to two decimal places).
(80 - 46.78)^2 = 1103.57
(30 - 46.78)^2 = 281.57
(34 - 46.78)^2 = 163.33
(32 - 46.78)^2 = 218.45
(55 - 46.78)^2 = 67.57
(27 - 46.78)^2 = 391.25
(38 - 46.78)^2 = 77.09
(41 - 46.78)^2 = 33.41
(84 - 46.78)^2 = 1385.33
b. Find the sum of the squared differences.
1103.57 + 281.57 + 163.33 + 218.45 + 67.57 + 391.25 + 77.09 + 33.41 + 1385.33 = 3721.57
c. Divide the sum of the squared differences by the number of scores (n = 9).
3721.57 / 9 = 413.51 (rounded to two decimal places)
Calculate the standard deviation:
Take the square root of the variance.
√413.51 = 20.33 (rounded to two decimal places)
The standard deviation of the scores is approximately 20.33 (rounded to two decimal places).
In a small town, households recycle on average 30% of their waste. The new recycling committee wants to increase this proportion and study the relationship between recycling and income. They select 25 households from the two wealthier neighborhoods and estimate a 92% confidence interval for the true proportion of recycling. What is the error term of this interval?. 1605 2. 00 points out of 3. 00 P Flag question 2. The same recycling committee also focuses on poor neighborhoods. How many households do they need to sample to get a 95% confidence interval, with an error of +/-0. 09? 100 3. Finally, the same recycling committee wants to know the probability of 12 random households recycling more than 45% of their waste. This probability is: 1292
A) the error term is 0.16039
B) number of households required to get a 95% confidence interval, with an error of ± 0.09 is 21.
C) The probability of 12 random households recycling more than 45% of their waste is approximately 0.045 or 4.5%.
Error term = z√(p(1-p)/n)
Error term = 1.75 √(0.30(1-0.30)/25)
= 0.16039
Thus, the error term is 0.16039
2 ) to find the ample size required to estimate the proportion of recycling in poor neighborhoods with an error of +/-0.09 and a 95% confidence level,
n = (z² * p * (1-p)) / E²
n = (1.96² * 0.5 * (1-0.5)) / 0.09²
= 21
So the number of households required to get a 95% confidence interval, with an error of ± 0.09 is 21.
3) To calculate the probability of 12 random households recycling more than 45% of their waste,
P(X > 12) = 1 - P(X <= 12)
P(X > 12) = 1 - P(X <= 12)
= 1 - 0.955
= 0.045
So the the probability of 12 random households recycling more than 45% of their waste is 0.045.
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Full Question:
In a small town, households recycle on average 30% of their waste. The new recycling committee wants to increase this proportion and study the relationship between recycling and income. They select 25 households from the two wealthier neighborhoods and estimate a 92% confidence interval for the true proportion of recycling. What is the error term of this interval?
The same recycling committee also focuses on poor neighborhoods. How many households do they need to sample to get a 95% confidence interval, with an error of +/-0. 09?
Finally, the same recycling committee wants to know the probability of 12 random households recycling more than 45% of their waste. This probability is: ?
If you spent $200 per month on lottery tickets, and you were very lucky and won
$100,000 once every 10 years, what would be your net wealth after 40 years?
I would be rich
$ 3904000 would be my net wealth
The value of net wealth after 40 years is,
= $304,000
What is Multiplication?To multiply means to add a number to itself a particular number of times. Multiplication can be viewed as a process of repeated addition.
Given that;
When you spent $200 per month on lottery tickets, and you were very lucky and won $100,000 once every 10 years.
Hence, Total spent money in 10 years is,
= $200 x 10 x 12
= $24,000
And, Total earning in 10 years = $100,000
So, The value of net worth in 10 years = $100,000 - $24,000
= $76,000
Thus, The value of net wealth after 40 years is,
= 4 x 76,000
= $304,000
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The graph below shows where the two functions y = f(x) and y = g(x) intersect. What are the solutions of the equation f(x) = g(x)?
A. -3, 2
B. -3, 0, 2
C. -3, -8, -4, 2
D. 0, -3
The solutions of the equation f(x) = g(x) include the following: B. -3, 0, 2, -4.
What is a point of intersection?In Mathematics and Geometry, a point of intersection simply refers to the location on a graph where two (2) lines intersect or cross each other, which is primarily represented as an ordered pair containing the point that corresponds to the x-coordinate (x-axis) and y-coordinate (y-axis) on a cartesian coordinate.
By critically observing the graph of the lines representing the given system of equations, we can reasonably and logically deduce that the correct solution set lies in both Quadrant II and IV and it is denoted by the point of intersection of both the x-coordinate (x-axis) and y-coordinate (y-axis), which is given by this ordered pair (-3, 0) and (2, -4).
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the wheels on annie's bicycle are $20$ inches in diameter. if each wheel makes $3$ full revolutions every second, then how many feet does annie travel in $1$ second? give your answer as an integer, rounded to the nearest foot. (a full revolution means a $360^\circ$ turn. remember that there are $12$ inches in a foot.)
The circumference of a circle is given by $C = \pi d$, where $d$ is the diameter of the circle. In this case, the diameter of Annie's bicycle wheels is $20$ inches, so the circumference of each wheel is:
$C = \pi d = \pi (20\text{ in}) \approx 62.83 \text{ in}$
Since each wheel makes 3 full revolutions every second, the distance that Annie travels in one second is:
$distance = 2C \cdot \text{revolutions per second} = 2 \cdot 62.83 \text{ in} \cdot 3 \approx 377 \text{ in}$
Converting inches to feet, we get:
$distance = 377 \text{ in} \cdot \frac{1 \text{ ft}}{12 \text{ in}} \approx 31 \text{ ft}$
Rounding to the nearest foot, Annie travels approximately $\boxed{31}$ feet in one second.
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a coin-operated coffee machine made by big corporation was designed to discharge a mean of eight ounces of coffee per cup. if it dispenses more than that on average, the corporation may lose money, and if it dispenses less, the customers may complain. big corporation would like to estimate the mean amount of coffee, , dispensed per cup by this machine. big will choose a random sample of cup amounts dispensed by this machine and use this sample to estimate . assuming that the standard deviation of cup amounts dispensed by this machine is ounces, what is the minimum sample size needed in order for big to be confident that its estimate is within ounces of ? carry your intermediate computations to at least three decimal places. write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (if necessary, consult a list of formulas.)
Once you have the required numerical values, plug them into the formula and calculate the minimum sample size needed for Big Corporation to be confident in their estimate of the mean amount of coffee dispensed per cup
We need to determine the minimum sample size required for Big Corporation to estimate the mean amount of coffee dispensed per cup with a certain level of confidence and margin of error.
Unfortunately, some of the numerical values are missing in question.
Step 1: Determine the desired confidence level (e.g., 90%, 95%, 99%).
Step 2: Identify the desired margin of error (e.g., within 0.1 ounces).
Step 3: Given the standard deviation of cup amounts (missing in the question, let's assume it as "σ").
Now, use the formula for determining the minimum sample size needed:
n = (Z² * σ²) / E²
where:
n = minimum sample size
Z = Z-score corresponding to the desired confidence level (e.g., 1.96 for 95% confidence)
σ = standard deviation of cup amounts
E = margin of error
Step 4: Calculate the minimum sample size (n) using the formula and round up to the nearest whole number.
By numerical values, plug them into the formula and calculate the minimum sample size needed for Big Corporation to be confident in their estimate of the mean amount of coffee dispensed per cup.
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