a. It will take 392 minutes for just 1 machine to produce same batch.
b. it will take 49 minutes for 8 machines to produce same batch.
How long does it take to produce the batches of newspapers?a) To get minutes its take for just 1 machine, we will use the following formula:
Time = (Number of machines * Original time) / New number of machines
Time = (7 * 56) / 1
Time = 392 / 1
Time = 392 minutes
b. To get minutes its take for just 8 machine, we will use the following formula:
Time = (Number of machines * Original time) / New number of machines
Time = (7 * 56) / 8
Time = 392 / 8
Time = 49 minutes.
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On the first day, a man walked 3 /8 of a journey. On the next day he covered another 2/5 of the journey. what fraction of the journey was covered?
Answer:
31/40
Step-by-step explanation:
3/8+2/5
Find the common denominator.
15/40+16/40
Add.
=31/40
Answer: 31/40
Step-by-step explanation:
3/8+2/5
make denominators equal, multiply by 8and 5
15/40+16/40=31/40
Please help please and thank you its due this week on wen
Answer: 100
hope this helps
|x/3| if x< 0 I need help
Step-by-step explanation:
If x < 0, we consider the absolute value of x/3.
The absolute value is always positive or zero, which means when x < 0, the expression becomes -x/3. This is because we remove the negative sign from negative numbers when finding the absolute value.
So, |x/3| = (-x)/3 when x < 0.
Answer:
-x/3
Step-by-step explanation:
because x < 0 , so lets take x = -3
Then | -3/3 |
= | -1 | = -(-1) = 1
There fore , | x/3 | for x < 0 = -x/3
Can someone give me a step by step tut on how 135 divided by 20 is 6.75…I just forgot.
Answer: 135/20=6.75
Step-by-step explanation:
Long division (picture attached below)
the health center at a college is trying to estimate what proportion of students are experiencing depression or anxiety. the health center will use a confidence level of 95% and a margin of error of 5%. prior research shows that the prevalence of mental illness in college students is about 15%.
The health center needs to survey approximately 196 students to estimate the proportion of students experiencing depression or anxiety with a 95% confidence level and a margin of error of 5%.
To estimate the proportion of students experiencing depression or anxiety, the health center at the college will need to conduct a survey of a random sample of students. With a confidence level of 95%, they can be 95% confident that the true proportion of students experiencing depression or anxiety falls within the range of the estimated proportion plus or minus the margin of error of 5%.
To determine the sample size needed for the survey, the health center will need to use a formula that takes into account the population size (number of students at the college), the desired confidence level, and the margin of error. With a population size of, say, 10,000 students, the sample size needed would be around 385 students.
If prior research shows that the prevalence of mental illness in college students is about 15%, then the health center can expect the proportion of students in their sample experiencing depression or anxiety to be around 15%. However, with the margin of error of 5%, the estimated proportion could range from 10% to 20%.
Overall, by conducting a survey with a random sample of students and using a confidence level of 95% and a margin of error of 5%, the health center at the college can estimate with a high degree of confidence the proportion of students experiencing depression or anxiety.
To estimate the proportion of students experiencing depression or anxiety at the college, the health center can follow these steps:
1. Use the prior research that shows the prevalence of mental illness in college students is about 15%. This will be used as the initial proportion (p) for the calculation.
2. Determine the desired confidence level (95%) and margin of error (5%). In this case, the confidence level is 95%, which corresponds to a z-score of 1.96 for a standard normal distribution. The margin of error is 5% (0.05).
3. Calculate the sample size required for the estimation using the formula:
n = (Z^2 * p * (1-p)) / E^2
where n is the sample size, Z is the z-score (1.96 for 95% confidence level), p is the initial proportion (0.15), and E is the margin of error (0.05).
4. Plug in the values and calculate the sample size:
n = (1.96^2 * 0.15 * (1-0.15)) / 0.05^2
n ≈ 196
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a math teacher claimed that the average grade of the students in her algebra 2 classes this year would be equal to the average grade of the same students in algebra 1 classes two years ago. the average grade of algebra 1 students two years ago was 92%. in a random sample of 25 current algebra 2 students, the average grade was 87%, with a standard deviation of 7%. is there enough evidence to reject the teacher's claim?
From the hypothesis test conducted, the calculated t-statistic of -3.57 is less than the lower critical t-value of -2.064. This tells us that the observed sample mean of 87% is significantly different from the claimed population mean of 92% at the 0.05 significance level. Therefore, the null hypothesis can be rejected and conclusions can be made that that there is enough evidence to suggest that the average grade of the students in the Algebra 2 class this year is not equal to the average grade of the same students in the Algebra 1 class two years ago.
How do we conduct a hypothesis test?To determine whether there is enough evidence to reject the teacher's claim, we can conduct a hypothesis test. A one-sample t-test will be us to compare sample mean.
Here are the sample statistics:
Sample size (n) = 25
Sample mean (X) = 87%
Sample standard deviation (s) = 7%
A significance level (α) of 0.05, wil be used
We first calculate the t-statistic, with (X - μ) / (s/√n),
t = (87 - 92) / (7/√25) = -5 / (7/5) = -3.57
Then, we check this value against the critical t-value for a two-tailed test with 24 degrees of freedom (n-1), and α = 0.05.
The critical t-values for a two-tailed test at α = 0.05 and df = 24 are approximately -2.064 and +2.064.
-3.57 t-test is less than the lower critical t-value of -2.064. This means that the observed sample mean of 87% is significantly different from the claimed population mean of 92% at the 0.05 significance level.
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0.612 and the 12 is repeating as a fraction
The Decimal 0.612 and the 12 is repeating as a fraction is 20.346/33.
Step 1: Let x = 0.612
Step 2: Multiply both sides by 1000 to remove the decimal point: 1000x = 612
Step 3: Since the 12 is repeating, we can subtract the non-repeating part from the repeating part to get 12 - 0 = 12. Then we can write the repeating part as a fraction with a denominator of 99 (which is one less than 100, the number of repeating digits). So we have: 0.12 = 12/99
Step 4: Rewrite the equation from step 2 using the value from step 3: 1000x = 612 + 12/99
Step 5: Simplify the right-hand side: 1000x = 61038/99
Step 6: Divide both sides by 1000 to solve for x: x = 61.038/99
Step 7: Simplify the fraction by dividing the numerator and denominator by their greatest common factor, which is 3: x = 20.346/33
Therefore, the decimal 0.612 and the 12 is repeating as a fraction is 20.346/33.
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Solve the given differential equation by variation of parameters. x2y'' + xy' − y = ln x
y (x) = ?
The solution to the given differential equation, x²y'' + xy' - y = ln(x), using variation of parameters is: y(x) = C₁x + C₂x ln(x) + x ln²(x)/2,
where C₁ and C₂ are constants.
Determine the differential equation?To solve the differential equation using variation of parameters, we first find the solutions to the homogeneous equation x²y'' + xy' - y = 0. Let's denote these solutions as y₁(x) and y₂(x).
Next, we find the Wronskian W(x) = y₁(x)y₂'(x) - y₁'(x)y₂(x) and calculate the integrating factors u₁(x) = -∫(y₂(x)ln(x))/W(x) dx and u₂(x) = ∫(y₁(x)ln(x))/W(x) dx.
Using these integrating factors, we can determine the particular solution yₚ(x) = -y₁(x)∫(y₂(x)ln(x))/W(x) dx + y₂(x)∫(y₁(x)ln(x))/W(x) dx.
Finally, the general solution is given by y(x) = yₕ(x) + yₚ(x), where yₕ(x) is the general solution to the homogeneous equation.
Solving the homogeneous equation x²y'' + xy' - y = 0 gives the solutions y₁(x) = x and y₂(x) = x ln(x).
After calculating the Wronskian W(x) = x² ln(x), we obtain the integrating factors u₁(x) = -ln(x)/2 and u₂(x) = -x/2.
Plugging these values into the particular solution formula, we find yₚ(x) = C₁x + C₂x ln(x) + x ln²(x)/2.
Hence, the general solution is y(x) = C₁x + C₂x ln(x) + x ln²(x)/2, where C₁ and C₂ are arbitrary constants.
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Find the difference between the smallest and largest 4 digit numbers
whose values does not change on reversing the digits
Using number theory, the difference between the smallest and largest is 8998.
What is the difference between the smallest and largest 4 digit numbers whose values does not change on reversing the digits?In order to determine the difference between the largest and smallest 4-digit in which the values do not change when their digits are reversed, we can start with;
This problem falls under number theory and we can apply some insight here;
In this case, the smallest value will be 1000 while the largest will be 9999
We can add 1 from 1000 till we reach 9999. For each number, we compare it with its reversed form. If they are equal, we store that number as a candidate for the smallest and largest numbers.
After checking all the numbers, we find that the smallest and largest numbers that meet the given criterion are:
Smallest number: 1001 (remains the same when digits are reversed)
Largest number: 9999 (remains the same when digits are reversed)
Now, we can calculate the difference between the smallest and largest numbers:
Difference = Largest number - Smallest number
Difference = 9999 - 1001
Difference = 8998
Therefore, the difference between the smallest and largest 4-digit numbers that do not change when their digits are reversed is 8998.
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PLEASE HELP ME
The circle graph describes the distribution of preferred transportation method from a sample of 400 randomly selected San Francisco residents.
circle graph titled San Francisco Residents' Transportation with five sections labeled walk 40 percent, bicycle 8 percent, streetcar 15 percent, bus 10 percent, and cable car 27 percent
Which of the following conclusions can be drawn from the circle graph?
Together, Walk and Cable Car are the preferred transportation for 268 residents.
Together, Walk and Streetcar are the preferred transportation for 55 residents.
Bicycle is the preferred transportation for 40 residents.
Bus is the preferred transportation for 50 residents.
A paper company produces 3,925 notebooks in 5 days. How many notebooks can it produce in 13 days?
A.10,150
B.10,205
C.2,041
D.3,753
B
The paper company can produce 785 papers in one day.
(3925÷5=785)
Therefore the paper company can produce 10205 papers in 13 days.
(785×13=10205)
Answer: B. 10,205
Step-by-step explanation: If in 5 days it produces 3,925 notebooks. Then what you should do is divide 3925 by 5. The answer for that equation is 785. So in 1 day they produce 785 notebooks. The last step you should do is multiply 785 by 13. 13 as in days and 785 as in the amount of notebooks made in one day. That's how you get 10,205 notebooks. Hope this helps :)
i honestly hate sparx maths!!!!!!!!!!!
Answer:
4
Step-by-step explanation:
R + the 4 spaces to T
How many F-ratios must we calculate for a two-way analysis of variance?
A) 1
B) 2
C) 3
D) 4
The correct answer is D) 4.
In a two-way analysis of variance, we are examining the effects of two independent variables (or factors) on a dependent variable. We must calculate four F-ratios to test the significance of these effects: two for the main effects of each factor, and two for the interaction effect between the two factors.
The F-ratio is a statistical test that compares the amount of variability between groups to the amount of variability within groups. By calculating F-ratios for each effect, we can determine whether the differences between groups are statistically significant and whether the independent variables have a significant impact on the dependent variable.
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how do the graphs of f(x)=|x| and g(x)=|5x| relate ?
a.
the graph of g(x) is the graph of f(x) compressed horizontally by a factor of 5
c.
The graph of g(x) is the graph of f(x) compressed horizontally by a factor of 1/5
b.
The graph of g(x) is the graph of f(x) compressed vertically by a factor of 5
d.
The graph of g(x) is the graph of f(x) compressed vertically by a factor of 1/5
A textbook is opened at random. What page numbers is the book opened to if the product of the opened page numbers is 132?
The book is opened to pages 11 and 12.
How to get the product of the page
So, we can write the equation:x * (x + 1) = 132
Expanding the equation, we get:
x² + x = 132
To solve for x, we need to rewrite the equation as a quadratic equation:
x²+ x - 132 = 0
Now, we can factor the quadratic equation:
(x - 11)(x + 12) = 0
This equation has two solutions for x:
x = 11
x = -12
Since page numbers cannot be negative, we discard the second solution. Thus, the left-hand page number is 11, and the right-hand page number is 11 + 1 = 12.
So, the book is opened to pages 11 and 12.
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What is the value of x in the given figure?
40°
210
O 20
O 40
O 50
O
85
PLEASE HELP ME ASAP
PLEASE HELP ME ASAP
Answer:
JE
Step-by-step explanation:
found it online
hat is the surface area of this right rectangular prism with dimensions of 6 inches by 4 inches by 12 inches? A.324 B.256 C.288 D.512
The surface area of the given right rectangular prism is 288 square inches.
The given dimensions of the right rectangular prism are:
Length = 6 inches
Width = 4 inches
Height = 12 inches
The surface area of a rectangular prism can be calculated using the formula:
Surface Area = 2lw + 2lh + 2wh
Substituting the values into the formula:
Surface Area = 2(6)(4) + 2(6)(12) + 2(4)(12)
Surface Area = 48 + 144 + 96
Surface Area = 288 square inches
Therefore, the surface area of the given right rectangular prism is 288 square inches.
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Three pieces of wood are cut from a plank 1 metre long.
Each piece is 30 cm long.
How long is the piece left over
Answer:
The piece left over is 10 cm long
Step-by-step explanation:
1 metre = 100 cm
Each piece = 30 cm long
Number of piece = 3
30 × 3 = 90
100 - 90 = 10 cm
Therefore, the piece left over is 10 cm long
hey anyone there *MUST ANSWER ASAP IM BEING TIMED*
Answer:it is the 2 one
Step-by-step explanation: trust me
Which equation represents a circle that has a radius of 4 and a center at (4,-4)
Answer:The circle has a center at (5,5) and a radius of 2. Therefore, the equation is (x-5)2+(y-5)2=22, or (x-5)2+(y-5)2=4.
Step-by-step explanation:
i did the qestion on my test
a triangle is conventionally used in a process flowchart to represent a storage area or queue.T/F
False. A rectangle is conventionally used in a process flowchart to represent a storage area or queue. Triangles are typically used in flowcharts to represent decision points, where a choice must be made between two or more alternatives.
Rectangles are used to represent activities or operations, while arrows connecting the shapes indicate the flow or direction of the process. The use of standardized shapes in flowcharts helps to make them easily understandable and accessible to a wide range of individuals, regardless of their background or experience with the specific process being depicted.
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according to census 2000, the highest proportion of married-couple households was in which state? question 14 options: utah mississippi montana
According to Census 2000, Utah had the highest proportion of married-couple households.
During the Census 2000, data was collected on the marital status of households in various states across the United States. The analysis revealed that Utah had the highest proportion of married-couple households among the given options of Utah, Mississippi, and Montana. This indicates that a larger percentage of households in Utah consisted of married couples compared to the other states during that time period. The Census data provides valuable insights into the demographic composition of different regions, helping to understand societal trends and patterns.
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Using the lines in the diagram shown, how many pentagons (of any size) can you trace?
Each line in every set of lines of the same color intersects with each line in two other sets. Because of that fact, there's a segment formed on each line in every set. Therefore, by tracing any segment from every set, we get a closed shape, which is a pentagon, as a result. Since there are 3 segments in each set and a pentagon has 5 sides, the number of pentagons we can trace is [tex]3\cdot3\cdot3\cdot3\cdot3=3^5=243[/tex].
Which of the following is true when using the empirical rule for a set of sample data? Select one: a. Approximately 68% of all observations are in the interval + s. b. Almost all observations are in the interval #2s. c. Approximately 68% of all observations are in the interval + 2s. d. Approximately 95% of all observations are in the interval + S.
When using the empirical rule for a set of sample data, the following statements are true: Approximately 68% of all observations are in the interval ± 1s (one standard deviation from the mean),Almost all observations are in the interval ± 3s (three standard deviations from the mean),Approximately 95% of all observations are in the interval ± 2s (two standard deviations from the mean),This statement, "Approximately 95% of all observations are in the interval + S", is incorrect.
When using the empirical rule for a set of sample data, the following statements are true:
a. Approximately 68% of all observations are in the interval ± 1s (one standard deviation from the mean).
b. Almost all observations are in the interval ± 3s (three standard deviations from the mean).
c. Approximately 95% of all observations are in the interval ± 2s (two standard deviations from the mean).
d. This statement, "Approximately 95% of all observations are in the interval + S", is incorrect. The empirical rule states that approximately 68% of all observations are in the interval ± 1s, not just "+ s".
Therefore, the correct answer is (c) Approximately 68% of all observations are in the interval + 2s.
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Find the lateral area of a regular prism with height h if the base of the prism is a square with side 2cm and h=125mm
The lateral surface area of a regular prism would be =100cm²
How to calculate the lateral surface area of a prism?To calculate the lateral surface area of a prism the formula that should be used would be given below such as follows;
Lateral surface area of prism = perimeter of base×height
The base = perimeter of square = 4a
where;
a = side length = 2cm × 4 = 8cm
Height = 125 mm = 12.5cm
Lateral surface area of prism = 8×12.5 = 100cm²
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Find the inverse of f(x):
f(x)=x^3+1
Step-by-step explanation:
y = x^3 + 1 switch x and y....then solve for y
x = y^3 + 1
x-1 = y^3
y = cubrt ( x-1) <====this is the inverse function
What expresiokn is equialent to 42x-48
The expression that is equivalent to 42x - 48 is: 6(7x - 8)
How to factorize algebraic expressions?An algebraic expression is defined as a mathematical phrase that includes both variables, constants, coefficients, and algebraic operations.
An algebraic expression is also considered as a variable expression described using its terms, and operations on the terms. For example, x + 3 can be described as "3 more than x".
We want to factorize the expression 42x - 48
The number that is common to both numbers is 6 and as such we have the expression factorized as:
6(7x - 8)
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Hi this to me is very hard i need a little help please lesson 18 extra practice hands on equations
The answers for the new work
verify that the conclusion of clairaut's theorem holds, that is, uxy = uyx. u = x4y3 − y4
The conclusion of Clairaut's theorem holds for u = x^4y^3 - y^4, as uxy = uyx.
To verify that the conclusion of Clairaut's theorem holds, we need to show that the mixed partial derivatives of u are equal. We have:
ux = 4x3y3
uy = 3x4y2 - 4y3
Taking the partial derivative of uy with respect to x, we get:
uyx = 12x3y2
Taking the partial derivative of ux with respect to y, we get:
uxy = 12x3y2
Since uxy = uyx, Clairaut's theorem holds for this function u.
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