The fractions which is represented by a repeating decimal is (a) 2/9.
A "Fraction" is a number which represents a part of a whole or a quotient of two numbers. It is represented in the form of a numerator over a denominator, where the numerator represents the part being considered and the denominator represents the whole.
A "Repeating-Decimal" is a decimal number that has repeating pattern of digits after the decimal point and this pattern of digits repeats infinitely.
Option(a) : The fraction is "2/9", and it's decimal value is 0.2222..
This decimal value 0.222.. represents a non-terminating decimal vale.
Option(b) : The fraction is "7/16", and it's decimal value is 0.4375, this decimal terminates after 4 decimal points.
Option(c) : The fraction is "8/25", and it's decimal value is 0.32, the decimal terminates two decimal points.
Option(d) : The fraction is "9/20", and it's decimal value is 0.45; it represents a terminating decimal.
Therefore, the correct options are (a).
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The given question is incomplete, the complete question is
Select all the fractions that are represented by a repeating decimal.
(a) 2/9
(b) 7/16
(c) 8/25
(d) 9/20
22) Which example shows how changes in supply and demand can change someone's income?
Question 22 options:
An employer has increased sales and needs to hire another person during lunch hour which increases that person's income.
A gym lays off an employee because it was discovered he lied on his application, so he lost the income from the job.
A health food restaurant surveys a small town but finds there is no demand for health food, so they avoid opening a store there.
An employee returns to work after she has a baby and immediately appreciates the increase in her income.
The example that shows how changes in supply and demand is "where an employer has increased sales and needs to hire another person during lunch hour which increases income." Correct option is A.
In this case, the increased sales represent an increase in demand for the employer's product or service, which creates the need for additional labor.
As a result, the employer hires another person, which increases the number of workers and, subsequently, the supply of labor. However, since the demand for the product or service has increased, the price for labor also goes up, which leads to an increase in the income of the person who was hired.
This is an example of how the interaction between supply and demand can affect the price and quantity of goods and services, as well as the wages and salaries of workers.
Correct option is A.
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(L7) The Converse of the Pythagorean Theorem states that if the sum of the squares of the lengths of two sides of a triangle is equal to the square of the measure of its third side, then the triangle is a(n) _____ triangle.
The Converse of the Pythagorean Theorem states that if the sum of the squares of the lengths of two sides of a triangle is equal to the square of the measure of its third side, then the triangle is a right triangle.
In mathematics, the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides. This theorem can be written as an equation relating the lengths of the sides a, b and the hypotenuse c, often called the Pythagorean equation: a² + b² = c²
The theorem is named for the Greek philosopher Pythagoras, born around 570 BC. The theorem has been proved numerous times by many different methods – possibly the most for any mathematical theorem. The proofs are diverse, including both geometric proofs and algebraic proofs, with some dating back thousands of years.
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a computer software magazine compares the rates of malware infection for computers protected by security software a with the rates of infection for computers protected by security software b. they found that out of 800 computers with security software a, 80 became infected with some type of malware after 1000 hours of internet interaction. for security software b, 45 out of 900 computers became infected after 1000 hours of internet interaction. assuming these to be random samples of infection rates for the two security software packages, construct a 98% confidence interval for the difference between the proportions of infection for the two types of security software packages. does the confidence interval contradict the claim that the proportion of infections is the same for the two types of security software? group of answer choices (-0.02, 0.02); no (0.02, 0.08); yes (-0.08, 0.02); no (0.05, 0.10); yes
In this scenario, a computer software magazine compares the rates of malware infection for computers protected by security software A and B.
To construct a 98% confidence interval for the difference between the proportions of infection for the two types of security software packages, follow these steps:
1. Calculate the proportions of infection for each security software (pA and pB):
pA = 80/800 = 0.1
pB = 45/900 = 0.05
2. Calculate the combined proportion (pC) and the standard error (SE) for the difference between proportions:
pC = (80 + 45) / (800 + 900) = 125/1700 = 0.0735
SE = sqrt((pC * (1 - pC)) * ((1/800) + (1/900))) = 0.0204
3. Find the z-score for a 98% confidence interval (z = 2.33 for a 98% CI).
4. Calculate the margin of error (ME) using the z-score and standard error:
ME = z * SE = 2.33 * 0.0204 = 0.0475
5. Calculate the confidence interval for the difference between proportions:
CI = (pA - pB) ± ME = (0.1 - 0.05) ± 0.0475 = 0.05 ± 0.0475 = (0.0025, 0.0975)
The 98% confidence interval is (0.0025, 0.0975), which can be rounded to (0.002, 0.098). This interval does not contain zero, which means it contradicts the claim that the proportion of infections is the same for the two types of security software. Therefore, the answer is (0.02, 0.098); yes.
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the following are the results of a hypothesis test for the difference between two population means: assume that the populations are normally distributed with unknown but equal variances. what is the p-value for the test?
The process of finding the p-value in a hypothesis test for the difference between two population means can be explained, given that the populations are normally distributed with unknown but equal variances.
1. Conduct the hypothesis test using either the t-test or z-test depending on the sample size and available information.
2. Calculate the test statistic (either t or z) using the sample means, sample sizes, and pooled variance.
3. Determine the degrees of freedom (df) for a t-test, which is calculated as (n1 - 1) + (n2 - 1), where n1 and n2 are the sample sizes.
4. Decide whether the test is one-tailed or two-tailed, based on the alternative hypothesis.
5. Use the test statistic and degrees of freedom (for t-test) to find the p-value from the appropriate distribution table (t-distribution or standard normal distribution).
Once you have the p-value, you can compare it with your chosen significance level (α) to decide whether to reject or fail to reject the null hypothesis.
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Find the mean for the number of yards gained by Roger during his seven carries in thefootball game: {2, 6, 20, 11, 8, 12, 4}.A 08B 09C 63D 07
The answer is option B) 09. To find the mean (average) of the yards gained by Roger during his seven carries, we need to add up all the yards gained and divide the sum by the number of carries.
So, for the given data set {2, 6, 20, 11, 8, 12, 4}, the total yards gained is:
2 + 6 + 20 + 11 + 8 + 12 + 4 = 63
The number of carries is 7.
Therefore, the mean yards gained per carry is:
Mean = Total yards gained / Number of carries
= 63 / 7
= 9
Hence, the answer is option B) 09.
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Your friend is trying to see if you can guess the two numbers she secretly has written on her paper. Your friend tells you that 2 times the first number is 13 more than the second number. She also tells you that the sum of the two numbers is 62.
Can you guess your friend's numbers?
If your friend tells you that 2 times the first number is 13 more than the second number, the two numbers are 25 and 37.
Let's assume the first number is represented by x and the second number is represented by y. According to the given information, we can create two equations:
2x = y + 13 (Equation 1)
x + y = 62 (Equation 2)
We can use Equation 2 to solve for x:
x = 62 - y
We can substitute this value of x in Equation 1 to solve for y:
2(62 - y) = y + 13
124 - 2y = y + 13
124 = 3y + 13
111 = 3y
y = 37
Now that we have found y, we can substitute this value in Equation 2 to solve for x:
x + 37 = 62
x = 25
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How can you decompose the composite figure to determine its area? as a circle, three rectangles, and a triangle as a circle, a trapezoid, and four triangles as a semicircle, three rectangles, and a square as a semicircle, a trapezoid, and two rectangles.
Answer:
The best way to decompose the composite figure to determine its area is as a semicircle, a trapezoid, and two rectangles. This way, we can use the following formulas to find the area of each part:
Area of a semicircle = 21πr2, where r is the radius of the circle.
Area of a trapezoid = 21(b1+b2)h, where b1 and b2 are the bases and h is the height of the trapezoid.
Area of a rectangle = l×w, where l is the length and w is the width of the rectangle.
Then, we can add up the areas of each part to find the total area of the composite figure. The other options are not as convenient because they either involve more parts or more complicated shapes. For example, option A would require finding the area of a triangle, which involves using trigonometry or the Pythagorean theorem. Option B would require finding the area of four triangles, which is more tedious than finding the area of two rectangles. Option C would require finding the area of a square, which is redundant because a square is a special case of a rectangle.
Step-by-step explanation:
The composite figure can be decomposed into a semicircle, a trapezoid, and two rectangles.
Option D is the correct answer.
What is a trapezium?It is a quadrilateral that has one pair of parallel sides and a height.
The area is calculated as: 1/2 x sum of the parallel sides x height.
Examples:
Area of a trapezium that has the parallel sides as 3 cm and 4 cm and a heght o 5 cm.
Area = 1/2 x (3 + 4) x 5
Area = 1/2 x 7 x 5
Area = 35/2 = 17.5 cm^2
We have,
The given figure can be decomposed into the following figure.
- Semicircle
- Trapezoid
- Two rectangles
Thus,
A semicircle, a trapezoid, and two rectangles.
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if $10,000 is invested at x percent simple annual interest for n years, which of the following represents the total amount of interest, in dollars, that will be earned by this investment in the n years?
The total amount of interest earned by the investment in n years is 100 times the product of the annual interest rate and the time period i.e., I = 100 * x * n
The total amount of interest earned by an investment can be calculated using the simple interest formula:
I = P * r * t
Where:
I = the total amount of interest earned
P = the principal investment amount
r = the annual interest rate as a decimal
t = the time period in years
In this case, the principal investment amount is $10,000, the annual interest rate is x percent (as a decimal, x/100), and the time period is n years. So, the total amount of interest earned can be represented by:
I = 10,000 * (x/100) * n
Simplifying this expression, we get:
I = 100 * x * n
Therefore, the total amount of interest earned by the investment in n years is 100 times the product of the annual interest rate and the time period. The units of this value will be dollars, since it represents the amount of interest earned.
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Assuming all conditions for inference are met, what defines a 95 percent confidence interval for the slope of the least-squares regression line?
Assuming all conditions for inference are met, a 95 per cent confidence interval for the slope of the least-squares regression line is defined as the range of values within which we are 95 per cent confident that the true population slope lies.
It is calculated as the point estimate (the slope of the least-squares regression line) plus or minus the margin of error, which is determined by multiplying the standard error of the slope by the critical value from the t-distribution with n-2 degrees of freedom (where n is the sample size). This critical value is chosen such that 95 per cent of the t-distribution falls within the interval. Therefore, a larger sample size or a smaller standard error will result in a narrower confidence interval, while a smaller sample size or a larger standard error will result in a wider confidence interval.
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Suppose one of the guests then takes some sips of pineapple juice from one of the glasses. Each sip is 1/64 gallon or 2 ounces. How many sips can the guest take before the glass is empty
Answer:
Step-by-step explanation:
(L3) Which triangle illustrates a centroid?
The centroid is a point of concurrency of the medians of a triangle. The medians are the line segments that connect each vertex of the triangle to the midpoint of the opposite side. The centroid is located at the intersection of the three medians, and it is often denoted by the letter G.
Every triangle has a centroid, and it is one of the most important points in a triangle. The centroid divides each median into two segments, with the segment connecting the vertex to the centroid being twice as long as the segment connecting the midpoint to the centroid. Therefore, the centroid is located two-thirds of the distance from each vertex to the midpoint of the opposite side.
To illustrate a triangle with a centroid, we can take any triangle and draw its three medians. The centroid is the point at which these three medians intersect. Any type of triangle, whether it is acute, obtuse, or right, will have a centroid. Therefore, any triangle can illustrate a centroid, and it is a fundamental concept in geometry that is used to solve many problems and prove theorems related to triangles.
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Please solve this and show work. Thank you have a blessed day!
Answer:
sin 40=280/diagonal,diagonal=280/sin40=435.6
x=cos40×435.6=333.68
A=333.68×280=93,423.9m^2
find two positive numbers satisfying the given requirements. the product is 48 and the sum of the first plus three times the second is a minimum.
The two positive numbers that satisfy the given requirements are 12 and 4.
what is algebra?
Algebra is a branch of mathematics that deals with mathematical operations and symbols used to represent numbers and quantities in equations and formulas.
Let's call the two positive numbers we're trying to find "x" and "y". We know that the product of x and y is 48, so:
x * y = 48
We also know that we want to minimize the sum of x and 3y, so we can set up an equation for that:
f(x,y) = x + 3y
Now we want to find the values of x and y that minimize this function, subject to the constraint that x * y = 48. We can use the method of Lagrange multipliers to solve this problem.
First, we set up the Lagrangian function:
L(x,y,λ) = x + 3y + λ(xy - 48)
Then we find the partial derivatives of L with respect to x, y, and λ:
∂L/∂x = 1 + λy
∂L/∂y = 3 + λx
∂L/∂λ = xy - 48
Setting the partial derivatives equal to zero, we get:
1 + λy = 0
3 + λx = 0
xy = 48
Solving for λ in the first equation, we get λ = -1/y. Substituting into the second equation and solving for x, we get x = -3/λ = 3y. Substituting x = 3y into the third equation, we get:
3y * y = 48
Simplifying, we get:
y² = 16
So y = 4 or y = -4. Since we're looking for positive numbers, we take y = 4. Then x = 3y = 12.
So the two positive numbers that satisfy the given requirements are 12 and 4.
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jace's math teacher plots student grades on their weekly quizzes against the number of hours they say they study on the pair of coordinate axes and then draws the line of best fit. based on the line of best fit, how much time should someone study to expect a quiz score of 96?
according to the line of best fit, someone should study approximately 10.67 hours to expect a quiz score of 96.
Without knowing the equation of the line of best fit, it's difficult to give an exact answer. However, we can use the line of best fit to estimate the number of hours of study needed to expect a quiz score of 96.
Assuming the line of best fit is a linear regression model, we can use the equation:
y = mx + b
where y is the quiz score, x is the number of hours studied, m is the slope of the line, and b is the y-intercept.
If we know the values of m and b, we can substitute them into the equation and solve for x when y = 96.
So, if the equation of the line of best fit is y = 1.5x + 80, then:
96 = 1.5x + 80
16 = 1.5x
x = 10.67
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(Q3) Apply the 45º-45º-90º Triangle Theorem to find the length of a leg of a right triangle if the length of the hypotenuse is 10 cm. Round to the nearest centimeter.
The length of a leg of the right triangle with a hypotenuse length of 10 cm is approximately 7 cm.
Applying the 45º-45º-90º Triangle Theorem, the length of a leg of a right triangle can be found by dividing the length of the hypotenuse by the square root of 2. In this case, with a hypotenuse length of 10 cm, the length of a leg can be determined.
The 45º-45º-90º Triangle Theorem states that in a right triangle with two equal legs, the length of a leg is equal to the length of the hypotenuse divided by the square root of 2.
In this case, the length of the hypotenuse is given as 10 cm. To find the length of a leg, we can divide the length of the hypotenuse by the square root of 2:
Leg = Hypotenuse / sqrt(2)
Substituting the given value, we have:
Leg = 10 cm / sqrt(2)
Using a calculator, the approximate value of the square root of 2 is 1.414. Therefore, we can calculate:
Leg = 10 cm / 1.414 ≈ 7.071 cm
Rounding to the nearest centimeter, the length of a leg is approximately 7 cm.
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The sum of two square number is also a square number.Find the numbers.
Answer:
x^2 + y^2 = z^2
There are infinitely many choices for whole numbers x, y, and z.
x = 7
To isolate x, always do the opposite of the number next to it.
5x = 35
The opposite of "× 5" is "÷ 5," so we ÷ 5 on both sides
5x = 35
5x ÷ 5 = 35 ÷ 5
x = 7 How do you solve an equation like: 5x = 35
Answer:
opposite operation
Step-by-step explanation:
divide 35 by 5 so x=7
write the largest open interval on which f is the antiderivative for f.
The largest open interval on which f is the antiderivative for f is called the indefinite integral of f, and it is denoted by ∫f(x)dx. This interval can be determined by finding all the antiderivatives of f and then taking the union of their domains. Note that the antiderivative of f is not unique, as it can differ by a constant, so the indefinite integral of f is only determined up to an arbitrary constant.
To find the largest open interval on which a function f is the antiderivative for f', we'll first need to know the function f' (the derivative of f). However, you didn't provide the function f' in your question.
To give you a general idea of how to approach this problem, follow these steps:
1. Given the function f'(x), find the critical points by setting f'(x) equal to 0 and solving for x.
2. Determine the intervals based on the critical points.
3. Check the behavior of f'(x) in each interval to see where it's continuous and increasing.
4. The largest open interval on which f is the antiderivative for f' will be the interval in which f'(x) is continuous and increasing.
If you provide the function f'(x), I can help you find the largest open interval for the antiderivative.
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if one u.s. dollar sells for 0.41 british pound, how many dollars should one british pound sell for? a. $1.8293 b. $3.0000 c. $2.3171 d. $2.4390 e. $2.6585
Answer:
[tex] \frac{1}{.41} = 2.4390[/tex]
One British pound should sell for $2.4390.
D is correct.
20) How can professional development impact human capital and income potential?
Question 20 options:
Professional development provides training that can increase employee value (capital) and impact earnings.
Professional development costs the company money and may fail to increase an employee's abilities.
Professional development helps employees learn new skills but is unlikely to affect salaries.
Professional development is ineffective at increasing employee value but may help employees get a promotion.
Professional development provides training that can increase employee value (capital) and impact earnings. So, correct option is A.
Professional development refers to the process of acquiring new knowledge, skills, and competencies that enhance an employee's ability to perform their job duties more effectively.
This process can take various forms, such as attending conferences, workshops, or training sessions, taking online courses, or pursuing a degree. Professional development can impact human capital and income potential by providing employees with new skills and knowledge that make them more valuable to their employer.
This increased value can lead to higher salaries, bonuses, and better job opportunities. Employers often seek individuals who have relevant and updated skills, and employees who continually invest in their professional development can stand out from the competition.
Additionally, professional development can enhance an employee's overall job satisfaction, leading to increased productivity and retention rates. In conclusion, professional development is an important investment for both employees and employers, as it can lead to increased human capital and income potential.
So, correct option is A.
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The Virginia Department of Environmental Quality (VDEQ) uses probabilistic monitoring to regulate the water quality of streams in the Commonwealth of Virginia. Of the 85 Eastern Virginia Sites (group 1), 17 do not meet minimum requirements. Of the 80 units sampled in Western Virginia Sites (group 2), 24 do not meet minimum requirements. Assume the data can be treated as independent simple random samples. The P-value of the test for equality of the proportions of streams that fail to meet minimum requirements in the two areas is Select one: a greater than 0.10. b between 0.01 and 0.05.
c between 0.05 and 0.10. d below 0.01.
Under the null hypothesis. Using a standard normal table or a calculator, we find that the P-value is between 0.05 and 0.10.
The answer is c) between 0.05 and 0.10.
What is null hypothesis?In statistics, the null hypothesis (H0) is a statement that assumes that there is no significant difference between two or more groups, samples, or populations.
To test for the equality of the proportions of streams that fail to meet minimum requirements in the two areas, we can use a two-sample test of proportions.
Let p1 be the true proportion of streams that fail to meet minimum requirements in group 1 (Eastern Virginia), and p2 be the true proportion of streams that fail to meet minimum requirements in group 2 (Western Virginia). The null hypothesis is that the two proportions are equal, i.e., H0: p1 = p2, and the alternative hypothesis is that they are not equal, i.e., Ha: p1 ≠ p2.
We can use the pooled estimate of the proportion, p, to test the null hypothesis. The formula for the pooled estimate of the proportion is:
p = (x1 + x2) / (n1 + n2)
where x1 and x2 are the numbers of streams that fail to meet minimum requirements in groups 1 and 2, respectively, and n1 and n2 are the sample sizes.
The test statistic is:
z = (p1 - p2) / √(p * (1 - p) * (1/n1 + 1/n2))
Under the null hypothesis, the test statistic follows a standard normal distribution.
The observed values are x1 = 17, n1 = 85, x2 = 24, n2 = 80.
The pooled estimate of the proportion is:
p = (17 + 24) / (85 + 80) = 0.202
The test statistic is:
z = (17/85 - 24/80) / √(0.202 * (1 - 0.202) * (1/85 + 1/80)) = -1.78
The P-value for a two-sided test is the probability of observing a test statistic as extreme as -1.78 or more extreme, under the null hypothesis. Using a standard normal table or a calculator, we find that the P-value is between 0.05 and 0.10.
Therefore, the answer is c) between 0.05 and 0.10.
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you are on soccer league with a total of 10 opposing teams, the pairings in the first round are at random. there are 4 out of state and 6 in-state opposing teams. what is the probability of playing against an in-state team?
In a soccer league the probability of playing against an in-state team is "0.6".
Given details:
Total no. of teams = 10
Total no. of in- state teams = 6
Total no. of out of state teams = 4.
The probability of playing against an in - state team is :
Probability = ( Number of favourable cases / Total outcomes).
= 6/10
= 0.6.
Therefore, the probability of playing against an in-state team is "0.6".
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A local college cafeteria has a self-service soft ice cream machine. The cafeteria provides bowls that can hold up to 16 ounces of ice cream. The food service manager is interested in comparing the average amount of ice cream dispensed by male students to the average amount dispensed by female students. A measurement device was placed on the ice cream machine to determine the amounts dispensed. Random samples of 85 male and 78 female students who got ice cream were selected. The sample averages were 7.23 and 6.49 ounces for the male and female students, respectively. Assume that the population standard deviations are 1.22 and 1.17 ounces, respectively.
a. Let μ1 and μ2 be the population means of ice cream amounts dispensed by all male and all female students at this college, respectively. What is the point estimate of μ1 â μ2?
b. Construct a 95% confidence interval for μ1 â μ2.
c. Using a 1% significance level, can you conclude that the average amount of ice cream dispensed by all male college students is larger than the average amount dispensed by all female college students? Use both approaches to make this test.
a. The point estimate of μ1 - μ2 is the difference between the sample means: 7.23 - 6.49 = 0.74 ounces.
b. The 95% confidence interval for μ1 - μ2 is (0.31, 1.17).
What is statistics?
Statistics is a branch of mathematics that deals with the collection, analysis, interpretation, presentation, and organization of numerical data.
a. The point estimate of μ1 - μ2 is the difference between the sample means: 7.23 - 6.49 = 0.74 ounces.
b. To construct a 95% confidence interval for μ1 - μ2, we can use the following formula:
( x1 - x2 ) ± zα/2 * √( s1²/n1 + s2²/n2 )
where x1 and x2 are the sample means, s1 and s2 are the sample standard deviations, n1 and n2 are the sample sizes, and zα/2 is the critical value from the standard normal distribution for a 95% confidence interval (zα/2 = 1.96).
Plugging in the values given, we get:
( 7.23 - 6.49 ) ± 1.96 * √( 1.22²/85 + 1.17²/78 )
= 0.74 ± 0.43
The 95% confidence interval for μ1 - μ2 is (0.31, 1.17).
c. To test whether the average amount of ice cream dispensed by all male college students is larger than the average amount dispensed by all female college students, we can use a two-sample t-test with a 1% significance level. The null hypothesis is that there is no difference between the two population means (μ1 - μ2 = 0), and the alternative hypothesis is that μ1 > μ2.
The test statistic is calculated as:
t = ( x1 - x2 ) / √( s1²/n1 + s2²/n2 )
Plugging in the values given, we get:
t = ( 7.23 - 6.49 ) / √( 1.22²/85 + 1.17²/78 )
= 3.05
Using a t-table with degrees of freedom = n1 + n2 - 2 = 161, we find that the critical value for a one-tailed test with a 1% significance level is 2.364.
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The perimeter of a 30-60 degree right triangle is 70. 98 inches. If the length of the hypotenuse is 30 inches, what is the length of the longest side?
The length of the shorter side is approximately 23.66 inches, and the length of the longer side is twice as long, or approximately 47.32 inches.
To find the length of the longest side, which is the hypotenuse, we're also given that it's 30 inches long.
Now, let's use what we know about the relationships between the sides of a 30-60 degree right triangle to find the length of the other two sides.
First, we know that the side opposite the 60 degree angle is always twice as long as the side opposite the 30 degree angle. So let's call the length of the shorter side (opposite the 30 degree angle) "x". Then the length of the longer side (opposite the 60 degree angle) is 2x.
Next, we can use the Pythagorean theorem to relate the lengths of the sides. In a right triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the lengths of the other two sides. So we have:
30² = x² + (2x)²
Simplifying this equation, we get:
900 = 5x²
Dividing both sides by 5, we get:
x² = 180
Taking the square root of both sides, we get:
x = √180
Now, we know that the perimeter of the triangle is the sum of the lengths of all three sides. So we have:
70.98 = x + 2x + 30
Simplifying this equation, we get:
100.98 = 3x + 30
Subtracting 30 from both sides, we get:
70.98 = 3x
Dividing both sides by 3, we get:
x = 23.66
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let the continuous random variables x and y be defined by the joint density function. determine e[x|y
The expected value of X given Y=y is given by 1/f(y) ∫x f(x,y) dx. This can be calculated by evaluating the integral ∫x f(x,y) dx over all possible values of X and dividing the result by f(y).
To find E[X|Y=y], we need to use the conditional expected value formula
E[X|Y=y] = ∫x f(x|y) dx
where the conditional density function of X for Y=y is denoted by f(x|y). f(x|y), the conditional density function, is defined as follows:
f(x|y) = f(x,y) / f(y)
where f(x,y) is the joint density function of X and Y, and f(x,y) is the marginal density function of Y.By integrating the joint density function across all possible values of X, given that we have the joint density function of X and Y, we may determine the marginal density function of Y:
f(y) = ∫f(x,y) dx from negative infinity to positive infinity.
Once we have the marginal density function of Y, we can then find the conditional density function of X given Y=y:
f(x|y) = f(x,y) / f(y)
Now, we can use the formula for the conditional expected value to find E[X|Y=y]:
E[X|Y=y] = ∫x f(x|y) dx
= [f(x,y)/f(y)] dx
= 1/f(y) ∫x f(x,y) dx
where the integral ∫x f(x,y) dx is over all possible values of X.
Therefore, to find E[X|Y=y], we need to evaluate the integral ∫x f(x,y) dx and divide the result by f(y). This will give us the conditional expected value of X given Y=y.
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Calculate arc length of curves. a.Calculate the circumference of a circle of radius r using what you learned in this class about length of curves. b. Find the exact length of the spiral defined by r(t)=â¨tcos(t),tsin(t),tâ© on the interval [0,2Ï].
a. The arc length or circumference of a circle of radius r is 2πr.
b. The exact length of the spiral defined by r(t) = ⟨tcos(t), tsin(t), t⟩ on the interval [0, 2π] is π√5 + ln(2 + √5).
What is arc of a circle?A circle's arc is defined as a portion or segment of its circumference.
a. The circumference of a circle of radius r can be found using the formula C = 2πr, where π is the constant ratio of the circumference to the diameter of a circle. Therefore, the arc length or circumference of a circle of radius r is 2πr.
b. To find the length of the spiral defined by r(t) = ⟨tcos(t), tsin(t), t⟩ on the interval [0, 2π], we can use the arc length formula:
L = ∫[tex]_a^b[/tex] √[dx/dt]² + [dy/dt]² + [dz/dt]² dt
Here, a = 0 and b = 2π, and we have:
dx/dt = cos(t) - tsin(t)
dy/dt = sin(t) + tcos(t)
dz/dt = 1
Therefore, the integrand under the square root becomes:
[dx/dt]² + [dy/dt]² + [dz/dt]²
= (cos²(t) + sin²(t) + 1) + t²(cos^2(t) + sin²(t) + 1)
= 2 + t²
Taking the square root and integrating from 0 to 2π, we get:
L = ∫[tex]_0^{(2\pi )[/tex] √(2 + t²) dt
= [(1/2)t√(2 + t²) + (1/2)ln|t + √(2 + t²)|]_[tex]0^{(2\pi )[/tex]
= π√5 + ln(2 + √5)
Therefore, the exact length of the spiral defined by r(t) = ⟨tcos(t), tsin(t), t⟩ on the interval [0, 2π] is π√5 + ln(2 + √5).
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A, C and D are points on a circle of radius 7 cm, centre O.
BA and BC are tangents to the circle.
OB = 12 cm
D
Work out the length of arc ADC.
Give your answer correct to 3 significant figures.
The length of the arc ADC of the circle with center O is found to be 32.8 cm.
Since BA and BC are tangents to the circle, we know that OA and OC are perpendicular to BA and BC, respectively, and that they pass through the center of the circle O. Thus, triangle OAB and triangle OCB are right triangles, and we can use the Pythagorean theorem to find their sides,
OA = OB - AB = 12 - 7 = 5 cm
OC = OB - BC = 12 - 7 = 5 cm
Since A, C, and D are on the circle, we know that the length of arc ADC is equal to the length of the circumference of the circle between A and C, minus the length of the arc AB and BC,
arc ADC = (circumference of circle between A and C) - arc AB - arc BC
The circumference of a circle with radius 7 cm is,
C = 2πr = 2π(7) = 14π cm
The length of arc AB and BC are both equal to the length of the tangent segment from point B to the circle. Since BA and BC are both tangent to the circle, they are congruent, so we can just find the length of one of them,
AB = BC = √(OB² - OA²)
BC = √(12² - 5²)
BC = √119
Now we can substitute the values we found into the equation for the arc ADC,
arc ADC = (circumference of circle between A and C) - arc AB - arc BC
= 14π - √119 - √119
= 14π - 2√119
Using a calculator to evaluate this expression to 3 significant figures, we get,
arc ADC ≈ 32.8 cm
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Complete question - A, C and D are points on a circle of radius 7 cm, center O. BA and BC are tangents to the circle. OB = 12 cm. Work out the length of arc ADC. Give your answer correct to 3 significant figures.
Which are not attributes of a square? Identify all.
The following are the attributes of a square
What are the attributes of a squareCongruent Sides: Every side of a square is precisely the same length, which renders them all congruent. Right Angles: Each internal angle of a square reflects ninety degrees - resulting in four right angles. Parallel Opposites: Whenever looking at a square, its opposing sides are always parallel to one another.Congruent Diagonal Lines: The diagonals of a square bisect and are a replica of each other in terms of length, hence demonstrationg their congruence.Right Angles with Diagonals: When inspecting the diagonals of a square, it becomes evident that they form right angles amongst themselves.Symmetry: As a consequence of foldability due to four lines of symmetry on both vertical, horizontal, and the two diagonal axes representing its likeness when halved, a square will appear completely similar.Read more on squares here:https://brainly.com/question/27307830
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Suppose you have a collection of 5-cent stamps and 8-cent stamps. We saw earlier that it is possible to make any amount of postage greater than 27 cents using combinations of both these types of stamps. But, let's ask some other questions: (a) Prove that if you only use an even number of both types of stamps, the amount of postage you make must be even. (b) Suppose you made an even amount of postage. Prove that you used an even number of at least one of the types of stamps. (c) Suppose you made exactly 72 cents of postage. Prove that you used at least 6 of one type of stamp.
We must have used at least 6 of one type of stamp.we get:
[tex]5n + 8m = 72[/tex]
The amount of postage you make must be even, we can use the fact that 5 cents and 8 cents are both even. Let's say we use n 5-cent stamps and m 8-cent stamps.
Since both types of stamps are even, the sum n5 + m8 will be even only if both n and m are even.
(b) Suppose we made an even amount of postage, say 2k cents. If we used an odd number of both types of stamps, then the total number of stamps we used would be odd. Let's say we used n 5-cent stamps and m 8-cent stamps.
(c) Suppose we made exactly 72 cents of postage, say using n 5-cent stamps and m 8-cent stamps. Then, we have:
[tex]n5 + m8 = 72[/tex]
we get:
[tex]5n5 + 5m8 = 360[/tex]
Rearranging, we get:
[tex]25n + 40m = 360[/tex]
we get:
[tex]5n + 8m = 72[/tex]
Now, we know that n and m are both non-negative integers, so the only possible values for m are[tex]0, 1, 2, 3, 4,[/tex] or[tex]5[/tex]. But if m is less than 6, then 5n + 8m is less than 40, which means we cannot make exactly 72 cents of postage. Therefore, we must have used at least [tex]6[/tex]of one type of stamp.
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3x+4+x=16 please help
Answer:
Step-by-step explanation:
3x+4+x=16
Combine like terms
(3x+x)+4=16
subtract 4
4x=12
Divide by 4
x=3
