When talking about a scale drawing or model, _____________ is determined by the ratio of a given length on the drawing or model to its corresponding length on the actual object. How do we write this as a fraction?

Answers

Answer 1

When talking about a scale drawing or model, the scale factor is determined by the ratio of a given length on the drawing or model to its corresponding length on the actual object.

This can be written as a fraction, with the length on the drawing or model as the numerator and the corresponding length on the actual object as the denominator. For example, if a drawing of a building has a scale factor of 1:100 and the length of a wall on the drawing is 5 cm, the corresponding length on the actual building would be 500 cm (5 cm x 100). Therefore, the scale factor can be written as 5/500 or simplified to 1/100.

When talking about a scale drawing or model, the term you're looking for is "scale factor." It is determined by the ratio of a given length on the drawing or model to its corresponding length on the actual object. To write this as a fraction, you would place the length on the drawing or model as the numerator and the corresponding length on the actual object as the denominator. For example, if the scale factor is 1:10, you would write it as 1/10.

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Related Questions

A large pizza had a diameter of 16 inches. What is the area of the top of the pizza

Answers

Answer:

approximately 200.96 square inches.

Step-by-step explanation:

The area of a circle is given by the formula A = πr^2, where r is the radius of the circle. Since the diameter of the pizza is 16 inches, the radius is half of the diameter, or 8 inches. Thus, the area of the top of the pizza is:

A = π(8)^2

A = 64π

Therefore, the area of the top of the pizza is 64π square inches. If you want a numerical approximation, you can use 3.14 as an approximation for π and calculate:

A ≈ 64(3.14)

A ≈ 200.96

So the area of the top of the pizza is approximately 200.96 square inches.

Answer:

about 201 sq.inches

Step-by-step explanation:

have a good day :)

for the following type of data set, would you be more interested in looking at the mean, median, or mode? state your reasoning.the salary of players on a professional baseball team

Answers

The mode, on the other hand, would not be a useful measure in this case, as it represents the most commonly occurring salary value.

What is mean?

In statistics, the mean (also known as the arithmetic mean or average) is a measure of central tendency that represents the sum of a set of numbers divided by the total number of numbers in the set.

For the salary of players on a professional baseball team, I would be more interested in looking at the mean.

The reason for this is that salaries of professional baseball players are typically not evenly distributed, with a few highly paid players at the top end and many players with lower salaries. The mean salary would provide an average value that takes into account the full range of salaries on the team, including the highly paid players.

The median salary would also be a reasonable measure to use in this case, as it represents the middle value of the distribution when the salaries are arranged in order from lowest to highest. However, it may not be as informative as the mean in capturing the full range of salaries and the distribution of highly paid players.

The mode, on the other hand, would not be a useful measure in this case, as it represents the most commonly occurring salary value, and it is unlikely that there would be many identical salaries among the players.

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Complete question is

For the following type of data set, would you be more interested in looking at the mean, median, or mode? state your reasoning.

The salary of players on a professional baseball team.

use the method of example 9.5.11 to answer the following questions. (a) how many distinguishable ways can the letters of the word millimicron be arranged in order?

Answers

Using permutation, there are 8 ways to arrange the letters of "millimicron" in order.

What is permutation?

A permutation is a way of arranging objects in a specific order. In mathematics, a permutation of a set is a bijection from the set to itself, where a bijection is a function that maps each element of the set to a unique element of the same set and vice versa.

To find the number of distinguishable ways the letters of the word "millimicron" can be arranged in order, we can use the method of example 9.5.11.

First, we count the number of times each letter appears in the word:

There are 2 "m"s

There are 2 "i"s

There are 2 "l"s

There is 1 "c"

There is 1 "r"

There is 1 "o"

There is 1 "n"

Then, we compute the number of permutations for each group of letters with the same count. The number of permutations of n items, where there are k items of one type, l items of another type, and so on, is given by:

n! / (k! l! ...)

Using this formula, we get:

There are 2! = 2 permutations of the "m"s

There are 2! = 2 permutations of the "i"s

There are 2! = 2 permutations of the "l"s

There is 1! = 1 permutation of the "c"

There is 1! = 1 permutation of the "r"

There is 1! = 1 permutation of the "o"

There is 1! = 1 permutation of the "n"

Therefore, the total number of distinguishable ways the letters of the word "millimicron" can be arranged in order is:

(2!)(2!)(2!)(1!)(1!)(1!)(1!) = 8

So there are 8 ways to arrange the letters of "millimicron" in order.

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What should be subtracted from thrice 13 by 5 to obtain 5 by 13

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The number that should be subtracted from thrice 13 by 5 to obtain 5 by 13 is 130.

What number should be subtracted?

The number that should be subtracted from thrice 13 by 5 to obtain 5 by 13 is calculated as follows;

let the number = n

thrice 13 by 5 = 3 (13) x 5 = 195

5 by 13 = 5 x 13 = 65

The value of the unknown number, n,  is calculated as;

195 - n = 65

n = 195 - 65

n = 130

Thus, when we subtract 130 from thrice 13 by 5, we will obtain 5 by 13 as shown in the calculation above.

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Let X = number of red Skittles in a fun size Skittles package. Then X is...

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Let X = number of red Skittles in a fun size Skittles package. Then X is a random variable, which means its value is uncertain and subject to chance.

The possible values of X range from 0 (if there are no red Skittles in the package) to the total number of Skittles in the package (if all Skittles are red). The probability distribution of X describes the likelihood of each possible value occurring.

The terms you've mentioned relate to the number of red Skittles in a fun size package. In this context, X represents a discrete random variable, as it can take on a finite number of distinct values (i.e., the possible counts of red Skittles in each package).

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Use the laplace transform to solve the given equation. Y'' − 2y' y = et, y(0) = 0, y'(0) = 3

Answers

The solution of the given differential equation is y(t) = [tex]e^{t}[/tex] cos(t) - sin(t) -t[tex]e^{t}[/tex]sin(t).

To solve the differential equation y'' - 2y'y = et, we will take the Laplace transform of both sides of the equation.

L{y'' - 2y'y} = L{et}

Using the linearity of the Laplace transform and the fact that

L{y''} = s²Y(s) - sy(0) - y'(0) and L{y'} = sY(s) - y(0), we get

s²Y(s) - sy(0) - y'(0) - 2[sY(s) - y(0)]Y(s) = 1/(s-1)

Substituting y(0) = 0 and y'(0) = 3, we get

s²Y(s) - 3s - 2sY²(s) = 1/(s-1)

Simplifying the equation and solving for Y(s), we get

Y(s) = [3s - 1 + 2/(s-1)]/[s² - 2sY(s)]

Multiplying both sides by (s² - 2sY(s)) and rearranging, we get

s²Y(s)² - 3sY(s) + 1 = 2Y(s)/(s-1)

Multiplying both sides by (s-1), we get

s²Y(s)² - 3sY(s) + (s-1) = 2Y(s)

Substituting Y(s) = U(s)/s, we get

sU(s)² - 3U(s) + (s-1) = 2U(s)

Simplifying and solving for U(s), we get

U(s) = (s-1)/(s² - 2s + 2)

To find the inverse Laplace transform of U(s), we will complete the square in the denominator of U(s)

s² - 2s + 2 = (s-1)² + 1

Using partial fraction decomposition, we can write

U(s) = [(s-1)/((s-1)²+1)] - [1/((s-1)²+1)]

Taking the inverse Laplace transform of both terms using Laplace transform table, we get

u(t) = [tex]e^{t}[/tex] cos(t) - sin(t)

Finally, taking the Laplace inverse of Y(s), we get

y(t) = L⁻¹{U(s)/s} = L⁻¹{[(s⁻¹)/((s⁻¹)²+1)]/s} - L⁻¹{[1/((s⁻¹)²+1)]/s}

Using the derivative property of the Laplace transform, we can simplify the second term as

L⁻¹{[1/((s⁻¹)²+1)]/s} = d/dt[L⁻¹{1/((s⁻¹)²+1)}] = d/dt[[tex]e^{t}[/tex] sin(t)]

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a soft drink machine can be regulated so that it discharges an average mean oz per cup. if the ounces of fill are normally distributed with a standard deviation of .4 oz, what value should mean be set at so that 98% of 6 oz cups will not overflow?

Answers

The mean fill in ounces should be set at 5.068 to ensure that 98% of 6 oz cups will not overflow.

To determine the value of mean that will ensure that 98% of 6 oz cups will not overflow, we can use the following steps:

Calculate the z-score corresponding to the desired percentile (98%):

Using a standard normal distribution table or calculator, we can find that the z-score corresponding to the 98th percentile is approximately 2.33.

Convert the given cup size (6 oz) to a z-score using the formula:

z = (x - μ) / σ

where x is the given cup size, μ is the mean fill in ounces, and σ is the standard deviation in ounces. Solving for μ, we get:

μ = x - z × σ

= 6 - 2.33 × 0.4

= 5.068

Therefore, the mean fill in ounces should be set at 5.068 to ensure that 98% of 6 oz cups will not overflow.

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The average 1- ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1- ounce chocolate chip cookies resulted in the following calorie amounts. At the a=0.01 level, is there sufficient evidence that the average calorie content is greater than 110 calories.
100 125 150 160 185 125 155 145 160 100 150 140 135 120 110

Answers

There is not sufficient evidence to conclude that the average calorie content of chocolate chip cookies is greater than 110 calories at the 0.01 level of significance.

What is null hypothesis?

The null hypothesis is a type of hypothesis that explains the population parameter and is used to examine if the provided experimental data are reliable.

We will use a one-sample t-test to test the hypothesis.

Null hypothesis: The mean calorie content of chocolate chip cookies is 110 calories.

Alternative hypothesis: The mean calorie content of chocolate chip cookies is greater than 110 calories.

We will use a significance level of α = 0.01.

We first calculate the sample mean and sample standard deviation:

[tex]$\bar{x} = \frac{1}{n} \sum_{i=1}^{n} x_i = \frac{1780}{15} = 118.67$[/tex]

[tex]$s = \sqrt{\frac{1}{n-1} \sum_{i=1}^{n} (x_i - \bar{x})^2} = \sqrt{\frac{1}{14} \sum_{i=1}^{n} (x_i - 118.67)^2} = 26.899$[/tex]

The test statistic is calculated as:

[tex]$t = \frac{\bar{x} - \mu_0}{s/\sqrt{n}} = \frac{118.67 - 110}{26.899/\sqrt{15}} = 1.84$[/tex]

Using a t-distribution table with 14 degrees of freedom and a one-tailed test at the 0.01 level, the critical value is 2.977.

Since the test statistic (1.84) is less than the critical value (2.977), we fail to reject the null hypothesis. Therefore, there is not sufficient evidence to conclude that the average calorie content of chocolate chip cookies is greater than 110 calories at the 0.01 level of significance.

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The type of measurement, the nature of the comparison, and the number of groups to be compared influence the statistical choice.
T/F

Answers

The type of measurement, the nature of the comparison, and the number of groups to be compared influence the statistical choice is true.

The choice of statistical test depends on several factors, including the type of measurement (nominal, ordinal, interval, or ratio), the nature of the comparison (independent or dependent), and the number of groups being compared.

For example, different statistical tests are used for comparing means between two groups, three or more groups, or paired observations within the same group. It is important to select the appropriate statistical test that matches the research question and the data being analyzed to ensure accurate and valid results.

Hence, The type of measurement, the nature of the comparison, and the number of groups to be compared influence the statistical choice is true.

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a set of ten test scores has a mean of 50 and a standard deviation of 10. one student drops the class so his score is removed set. if his score was a 30, what would happen to the mean and the standard deviation? (a) decrease, decrease (b) decrease, increase (c) increase, decrease d) increase, increase (e) cannot tell form the information given

Answers

the mean  decrease and the standard deviation  increase.

To find the new mean and standard deviation, we need to remove the score of 30 from the original set of ten test scores and recalculate the mean and standard deviation based on the remaining nine scores.

First, we can find the sum of the original set of ten test scores:

10 * 50 = 500

Then, we can subtract the score of 30:

500 - 30 = 470

Now we can find the new mean based on the remaining nine scores:

470 / 9 = 52.22

Next, we can find the sum of the squared deviations from the new mean:

(52.22 - 50)^2 + ... + (52.22 - x)^2

where x is the score of the remaining student.

Since we don't know the value of x, we can't calculate the exact value of the standard deviation for the new set of nine scores. However, we do know that the standard deviation is a measure of how spread out the scores are, and removing a score that is below the mean (such as the score of 30) will tend to make the scores less spread out. Therefore, we can conclude that the standard deviation of the new set of nine scores would likely decrease.

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Jared works at Cycle Craze and needs to assemble 280 bicycles. Jared has assembled 25% of the bicycles. How many bicycles still need to be assembled?

Answers

Answer:

210 bicycles

Step-by-step explanation:

If Jared has assembled 25% of the bicycles, then the remaining percentage of bicycles that need to be assembled is:

100% - 25% = 75%

To find out how many bicycles still need to be assembled, we can multiply the total number of bicycles by the remaining percentage:

Number of bicycles still to be assembled = 75% of 280 bicycles

Number of bicycles still to be assembled = (75/100) x 280

Number of bicycles still to be assembled = 0.75 x 280

Number of bicycles still to be assembled = 210

Therefore, Jared still needs to assemble 210 bicycles.

If we roll a single six‑sided die, the probability of rolling a 6 is 1/6. If we roll the die 60 times, how many times will we roll a 6?

Answers

Answer:

about 10 times

Step-by-step explanation:

60 times 1/6 (probability ) = 60/6 or 10

A bag contains 4 blue marbles, 4 red marbles, and 4 green marbles. what is the probability of drawing 2 green marbles if the first marble is not replaced after the first draw?

Answers

Answer: 1/11

Step-by-step explanation: to get the answer you add all of the marbles and you get 12 you then see that to get the first marble the probability is 4/12 you then have to multiply the second probability which its 3/11 because it is without replacement. you multiply them together and get 1/11 which is your answer

Answer: 1/11

Step-by-step explanation:

P(E)= 4/12*3/11

      = 1/3*3/11

      = 1/11

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to calculate the rate of growth a population is displaying, you must measure the rate and subtract the rate.
T/F

Answers

Population growth rate is determined by the difference between the birth rate and the death rate, and the net migration rate.

This statement is incorrect. The rate of growth of a population cannot be calculated by simply measuring and subtracting a rate. Population growth rate is determined by the difference between the birth rate and the death rate, and the net migration rate.

To calculate the population growth rate, you need to use the following formula:

Population Growth Rate = (Birth Rate - Death Rate) + Net Migration Rate

The birth rate is the number of live births per 1000 people in a given population in a given year, and the death rate is the number of deaths per 1000 people in the same population and year. The net migration rate is the difference between the number of people immigrating to a country and the number of people emigrating from the same country.

By plugging in the values for the birth rate, death rate, and net migration rate, you can calculate the population growth rate.

A positive value indicates a population increase, while a negative value indicates a population decrease.

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Enter the value for x that makes the equation 27=13(6x−9)+3x true

Answers

The value of x that makes the equation true is x = 16/9.

To solve for x in the equation 27=13(6x−9)+3x, we first simplify the right-hand side by distributing the 13:

27 = 78x - 117 + 3x

Then, we can combine like terms by adding 117 to both sides:

144 = 81x

Finally, we isolate x by dividing both sides by 81:

x = 144/81 = 16/9

This means that if we substitute x = 16/9 into the original equation, both sides will be equal.

In the context of the problem, this value of x represents the solution that satisfies the equation. It indicates that the given equation is consistent and has a unique solution for x.

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Definition of a derivative (limit of the difference quotient)

Answers

The derivative of a function f(x) at a point x = a is defined as the limit of the difference quotient as h approaches zero:

f'(a) = lim (h → 0) [f(a + h) - f(a)] / h

What is derivative?

The derivative of a function in calculus measures the function's sensitivity to changes in its input variable. Specifically, at a particular point, it represents the function's rate of change with respect to its input variable at that moment.

The derivative of a function f(x) at a point x = a is defined as the limit of the difference quotient as h approaches zero:

f'(a) = lim (h → 0) [f(a + h) - f(a)] / h

This limit represents the instantaneous rate of change or slope of the function at the point x = a. The difference quotient is the change in the function value divided by the change in the input variable (or the distance between two points on the graph of the function).

The derivative is a fundamental concept in calculus, and it has many applications in various fields of science, engineering, and economics. It allows us to calculate important quantities such as velocity, acceleration, and marginal cost, and it is used to optimize functions and solve many real-world problems.

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For a two-tailed test at 12. 66% significance level, the critical value of z is:.

Answers

for a two-tailed test at a 12.66% significance level, the critical values of z are approximately +1.53 and -1.53. We are looking for the z-score that corresponds to the area to the right of it (for the positive critical value) equal to 0.0633.

For a two-tailed test at a 12.66% significance level, we need to find the critical value of z.

Step 1: Determine the significance level for each tail.
Since this is a two-tailed test, we need to divide the overall significance level (12.66%) by 2. This gives us 6.33% (or 0.0633 in decimal form) in each tail.

Step 2: Find the z-score associated with the given significance level.
To find the critical value of z, you can use a z-table or an online calculator. We are looking for the z-score that corresponds to the area to the right of it (for the positive critical value) equal to 0.0633.

Using a z-table or calculator, you'll find that the z-score is approximately ±1.53.

So, for a two-tailed test at a 12.66% significance level, the critical values of z are approximately +1.53 and -1.53.

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Madison bought headphones online for $65. She used a coupon code to get a 30% discount. The website also applied a 10% processing fee to the price after the discount. How much was the discount, in dollars and cents?

Answers

The price of the headphones after the discount is $14.95

How to calculate the price of the headphone after the discount?

Madison bought headphones for $65

She used a coupon code of 30% discount

= (1-30/100)× (1 +10/100)

= (1-0.3) × (1 + 0.1)

= 0.7 × 1.1

= 0.77 × 65

= 50.05

The price after discount is

= 65-50.05

= $14.95

Hence the price after discount is $14.95

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create a scatter plot of these two variables, with age as the x variable and bone density loss as the y variable. what is your conclusion about this linear relationship; and what is the slope of the least squares regression line?a.the correlation coefficient is approx 0.57, with a positive direction; the slope is 0.41.b.moderately strong negative linear relationship; slope of the least squares line is approx negative 0.41.c.a circular linear positive relationship; slope of the least squares line is approx positive 0.41d.none of the above

Answers

The correct option is (a) The correlation coefficient is approximately 0.57, with a positive direction; the slope is 0.41.

A scatter plot is a graph in which the values of two variables are plotted along two axes. The pattern of the resulting points reveals any correlation present between the two variables. If a line can be drawn through the points in such a way that most of the points fall close to the line, then there is a strong correlation between the two variables.

According to the given options, option (a) is the correct one as it states that the correlation between the age and bone density loss is positive and moderately strong, and the slope of the least squares regression line is 0.41. A positive correlation indicates that as the age of a person increases, the bone density loss also increases.

The slope of the least squares regression line measures the steepness of the line that best fits the data, and it tells us how much the bone density loss is expected to increase for a one-year increase in age.

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--The given question is incomplete, the complete question is given

" create a scatter plot of these two variables, with age as the x variable and bone density loss as the y variable. what is your conclusion about this linear relationship; and what is the slope of the least squares regression line?a.the correlation coefficient is approx 0.57, with a positive direction; the slope is 0.41.b.moderately strong negative linear relationship; slope of the least squares line is approx negative 0.41.c.a circular linear positive relationship; slope of the least squares line is approx positive 0.41d.none of the above "--

Part A. Given (F/P, i, N) = P(1+i)", and (P/F, i, N) = F/(1+i)", prove the following formula. (a) F = A (F/A, i, N) = 4(4+0)^-4 P = A1 (P/A1,9,1,N) (b) P=A (P/A, i, N) = 4(4+0) -G#5) (c) P=G(P/G, i,N) = G((1+i)N-in- NA (d) A = G (A/G, i,N) = G447 (i) -IN, i[(1+i)N-1] (e) AL -1 i(1+i)N (1+i) 1 if i #g if i = g 1+i

Answers

As we have proved that the formula F = A(F/A, i, n) = A[((1+i)ⁿ - 1)/i] and it  shows that the future value of an annuity can be calculated by multiplying the annuity payment by the sum of a geometric series with a common ratio.

Let's assume that the annuity has n payments, and each payment is denoted by A. The future value of the first payment is A(1+i)ⁿ-1. This is because the first payment will earn interest for n periods, which is represented by (1+i)ⁿ, and then we subtract the original payment A because it was not earning interest. Similarly, the future value of the second payment will be A(1+i)ⁿ-2, and so on.

Therefore, the total future value of the annuity will be the sum of all the future values of each payment. We can express this as:

F = A(1+i)ⁿ-1 + A(1+i)ⁿ-2 + ... + A(1+i)⁰

Now, let's try to simplify this expression. We can factor out A to get:

F = A[(1+i)ⁿ-1 + (1+i)ⁿ-2 + ... + (1+i)⁰]

Notice that the expression inside the brackets is a geometric series with a common ratio of (1+i)⁻¹ and n terms. We can use the formula for the sum of a geometric series to simplify this expression further. This formula is:

S = a(1-rⁿ)/(1-r)

where a is the first term, r is the common ratio, and n is the number of terms.

In our case, the first term is (1+i)ⁿ-1, the common ratio is (1+i)⁻¹, and there are n terms. Therefore, we can substitute these values into the formula to get:

S = (1+i)ⁿ-1[(1+i)⁻ⁿ - 1]/[(1+i)⁻¹ - 1]

Simplifying this expression gives:

S = [(1+i)ⁿ - 1]/i

Now, substituting this value of S into the expression we obtained earlier for F, we get:

F = A[(1+i)ⁿ-1 + (1+i)ⁿ-2 + ... + (1+i)⁰]

= A[(1+i)ⁿ - 1]/i

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Complete Question:

Given (F/P, i, N) = P(1+i)ⁿ, and (P/F, i, N) = F/(1+i)ⁿ, prove the following formula

F =  A(F/A, i , n)  = A [((1+i)ⁿ - 1) / i]

Solve. 3w-4z=8 solve. 2w+3z=-6


a)w=-3 b) w=0 c) w=4 d) w=-2


z=0 z=-2 z=1 z=0

Answers

The equations are solved to w = 0 and z = -2. Option B

How to determine the value

From the information given, we have the simultaneous equations as

3w-4z=8

2w+3z=-6

Make w the subject from equation 1

w = 8 + 4z/3

Substitute the value into equation 2, we have that;

2(8 + 4z/3) + 3z = -6

expand the bracket, we get;

16 + 8z/3 + 3z = -6

find the LCM, we have;

16 + 8z + 9z/3 = -6

cross multiply

16 + 17z = - 18

add the values

19z = -34

Make 'z' the subject

z =-2

Substitute the value

3w - 4z = 8

3w = 8 - 8

w = 0

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13) Which example best shows a safety issue related to a large manufacturing business?

Question 13 options:

The machines at the business are found to waste energy and cause excess costs.


Broken machinery and flammable chemical containers are left sitting in the parking lot.


Poverty has forced the neighborhood surrounding a business to become deserted.


The flu season has caused a high rate of absent employees at the business.

Answers

The "best-example" which shows the "safety-issue" related to large "manufacturing-business" is (b) broken machinery and flammable chemical containers are left sitting in "parking-lot".

The leaving of broken machinery and flammable chemical containers in the "parking-lot" poses a dangerous "safety-hazard" to both the employees and the surrounding community.

The broken machinery can cause accidents, while the flammable chemical containers can potentially leak or catch fire, leading to explosions and other dangerous situations. Therefore, it is crucial for the business to properly dispose of such hazardous waste and maintain a safe working environment.

Therefore, the correct option is (b).

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The given question is incomplete, the complete question is

Which example best shows a safety issue related to a large manufacturing business?

(a) The machines at the business are found to waste energy and cause excess costs.

(b) Broken machinery and flammable chemical containers are left sitting in the parking lot.

(c) Poverty has forced the neighborhood surrounding a business to become deserted.

(d) The flu season has caused a high rate of absent employees at the business.

(Q2) Order the sides of ΔDEF from shortest to longest.

Answers

The order would be DE < FD < EF. To order the sides of triangle ΔDEF from shortest to longest, you need to compare the lengths of the sides.

1. Determine the lengths of sides DE, EF, and FD.
2. Compare the lengths to find the shortest side.
3. Identify the next shortest side.
4. The remaining side will be the longest.

Once you have the side lengths, simply arrange them in ascending order (from shortest to longest) to answer your question. For example, if DE is 3 units, EF is 5 units, and FD is 4 units, the order would be DE < FD < EF.
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Part 2: How many phone numbers can be made if the first digit must be 1, the second digit must
be a number in the range 3-5, the third digit must be a number in the range (6-9), and the last
seven digits can be any single digit number 0-9?
I

Answers

Answer: There are 21,000,000 phone numbers that can be made under the given constraints.

Step-by-step explanation:

Given the first digit must be 1, the second digit must be a number in the range of 3-5, the third digit must be a number in the range of 6-9, and the last seven digits can be any single digit number 0-9.

There are 3 possible choices for the second digit (3, 4, or 5) and 4 possible choices for the third digit (6, 7, 8, or 9). For the last seven digits, there are 10 choices for each digit.

Therefore, the total number of phone numbers that can be made is:

1 x 3 x 4 x 10 x 10 x 10 x 10 x 10 x 10 x 10 = 21,000,000

Thus, there are 21,000,000 phone numbers that can be made under the given constraints.

Answer:

Step-by-step explanation:

Select all the true statements

You can compare irrational numbers using rational approximation

Square roots can be compared and ordered by comparing and ordering that numbers underneath the radicals symbol

You cannot compare the value of rational and irrational numbers

The closer together the numbers being compared, the more decimal places you need to use

All irrational numbers have some repeating pattern witch can be used to compare them to rational numbers

Answers

Answer:

based on the statements, here are the ones I would select as true

Step-by-step explanation:

You cannot compare the value of rational and irrational numbers, The closer together the numbers being compared, the more decimal places you need to use

suppose you have a graph with vertices and edges that satisfies . must the graph be a tree? prove your answer.

Answers

If a graph has vertices and edges such that there are no cycles (i.e. it is acyclic) and it is connected, then the graph must be a tree.

To prove this, we first note that a tree is defined as a connected, acyclic graph. Therefore, if we can show that a graph with the given properties is also connected and acyclic, then it must be a tree.

First, let us prove that the graph is connected. Since there are no cycles, every vertex must be part of a path. Moreover, since there are no isolated vertices, every vertex is connected to at least one other vertex. Therefore, if we start at any vertex and follow any path, we will eventually reach all other vertices. Hence, the graph is connected.

Next, let us prove that the graph is acyclic. Suppose, for the sake of contradiction, that the graph contains a cycle. Let v1, v2, ..., vn be the vertices of the cycle in order. Since the graph is connected, there must be a path from v1 to vn that does not include any of the vertices v2, ..., vn-1 (otherwise, we could "short-circuit" the cycle). But this path, together with the edges (v1, v2) and (vn-1, vn), forms a cycle, contradicting our assumption that the graph is acyclic. Therefore, the graph is acyclic.

Since the graph is both connected and acyclic, it must be a tree. Therefore, a graph with vertices and edges that satisfies the given conditions must be a tree.

No, the graph does not necessarily have to be a tree.

How to determine the proof

The formula v = e + 1 signifies that one more than the number of edges (e) is the number of vertices (v).

This formula is valid for all connected graphs with one extra edge, besides the necessary edges for forming a tree.

Thus, it is possible that the diagram remains with loops and more offshoots, classifying it as a graph that is connected, yet not a tree.

The equation v = e + 1 does not limit the graph's structure beyond its connectedness.

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Find two numbers that each have exactly 16 factors, two of which are 8 and 12. ​

Answers

Two numbers that each have exactly 16 factors two of which are 8 and 12 are 120 and 168

Factors of 120 = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60 and 120

Total number of factors of 120 = 16

Pairs of factors = (1, 120) (2,60) (3,40) (4,30) (5,24) (6,20) (8,15) (10,12)

Total Pairs of factor = 8

Hence the number of total factors = 16

Factors of 168 = 1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84 and 168

Total number of factors of 168 = 16

Pairs of factors = (1, 168) (2,84) (3,56) (4,42) (6,28) (7,24) (8,21) (12,14)

Total Pairs of factor = 8

Hence the number of total factors = 16

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If the ratio d/a = 7, how many complete interference fringes within the central diffraction peak do you expect to observe?

Answers

We can expect to observe 14 complete interference fringes within the central diffraction peak.

What is diffraction?

The act of bending light around corners such that it spreads out and illuminates regions where a shadow is anticipated is known as diffraction of light. In general, since both occur simultaneously, it is challenging to distinguish between diffraction and interference.

The number of complete interference fringes within the central diffraction peak depends on the specific experimental setup, such as the distance between the slits and the screen, the distance between the slits, and the wavelength of the light being used.

However, we can use the following equation to calculate the number of interference fringes within the central diffraction peak:

N = (2d/a)(L/λ)

where N is the number of interference fringes, d is the distance between the slits, a is the width of the slits, L is the distance between the slits and the screen, and λ is the wavelength of the light being used.

Assuming that we have a double-slit setup and the distance between the slits and the screen is much larger than the slit width, we can simplify the equation to:

N = 2d/a

Given that d/a = 7, we can substitute this value into the equation to get:

N = 2(7) = 14

Therefore, we can expect to observe 14 complete interference fringes within the central diffraction peak.

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A random variable is normally distributed. It has a mean of 213 and a standard deviation of 23. if you take a sample of size 14, can you say what the shape of the sampling distribution for the sample mean is? Why?

Answers

Yes, we can say that the shape of the sampling distribution for the sample mean will be approximately normal, even if the population distribution is not normal, due to the Central Limit Theorem (CLT).

According to the CLT, as the sample size increases, the sampling distribution of the mean tends to become normal regardless of the shape of the population distribution, as long as the sample size is sufficiently large (typically, n ≥ 30). In this case, the sample size is 14, which is less than 30, but the normality assumption can still be used as an approximation due to the fact that the population distribution is already normal.

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122. which of the following statements about influential scores are true? i. influential scores have large residuals. ii. removal of an influential score sharply affects the regression line. i. an x-value that is an outlier in the -variable is more indicative that a point is influential than a y-value that is an outlier the y-variable. (a) i and ii (b) 1 and iii (c) ii and iii (d) i, il, and ii (e) none of these are true

Answers

Influential scores, indicated by large residuals, have a significant impact on the regression line when removed from the data. These points, characterized by extreme x or y-values, can alter the slope and intercept of the regression line, emphasizing their importance in regression analysis.

The correct statements about influential scores are i and ii.

i. Influential scores have large residuals because they have a strong effect on the regression line. This means that if we remove an influential score from the data, it will significantly change the slope and intercept of the regression line.

ii. Removal of an influential score sharply affects the regression line because influential scores have a large impact on the regression line. If we remove an influential score, it will significantly change the slope and intercept of the regression line.

iii. This statement is not true. An x-value that is an outlier in the x-variable may be indicative of a point being influential, but a y-value that is an outlier in the y-variable can also be indicative of a point being influential.

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