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MATH SOLVE
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Working together, machine J, machine K, and machine L can complete a job in 12 minutes. Working alone, machine J can complete a job in 20 minutes. Machine J worked alone for a given amount of time. Then, machines K and L worked together, and with no other machine, for the same amount of time. How long the total time required?
General
2 months ago
A small town has 800 inhabitants. At 8 AM, 120 people have heard a rumor. By noon half the town has heard it. At what time will 90% of the population have heard the rumor? (Do not round k in your calculation. Round the final answer to one decimal place.)
General
2 months ago
Find the vertex, focus, directrix, and focal width of the parabola. (5 points) negative 1 divided by 20 times x squared = y
General
2 months ago
you have four cards, labeled 2-5. what is the probability of drawing a number less than 3, putting the card back, then drawing a prime number?
General
2 months ago
Evaluate the sum from n equals three to seven of quantity two n plus five. A. 75 B. 77 C. 96 D. 98
General
2 months ago
What values do x and y have if |x| =16 and |y| =16, and when x and y are combined they equal 0
General
2 months ago
Let X and Y be independent continuous random variables that are uniformly distributed on (0,1). Let H=(X+2)Y. Find the probability P(lnH≥z) where z is a given number that satisfies ez<2. Your answer should be a function of z.Hint: Condition on X.P(lnH≥z1)= ? Let X be a standard normal random variable, and let FX(x) be its CDF. Consider the random variable Z=FX(X). Find the PDF fZ(z) of Z. Note that fZ(z) takes values in (0,1) .fZ(z)= ?
General
2 months ago
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants, 14 failed the test. Develop a 99% confidence interval for the proportion of applicants that fail the test. Would it be reasonable to conclude that more than 10% of the applicants are now failing the test?
General
2 months ago
Find the centroid of the region that is bounded below by the x-axis and above by the ellipse left parenthesis StartFraction x squared Over 4 EndFraction right parenthesis plus left parenthesis StartFraction y squared Over 9 EndFraction right parenthesis equals 1 x2 4 y2 9
General
2 months ago
The volume of this triangular prism is 247.5 cubic inches. What is the value of t?t = __ inches
General
2 months ago
Isabel and Jared each made a pan of brownies . Their pans of brownies were exactly the same size. After the first day, there was 1/4 of one pan and 2/12 of the other pan left. What fraction of the brownies were eaten? Show your work
General
2 months ago
WILL MARK BRAINLIEST:What is the equation of a line that passes through the point (1, 8) and is perpendicular to the line whose equation is y=x/2+3?
General
2 months ago
can someone help me with my math? it is about 45 questions and wont take too long :(
General
2 months ago
The Bailey family is traveling 565.5 miles for a family vacation. Ifthey estimate they can travel 78 miles per hour, then how many hourswill take for the Baileys to arrive?
General
2 months ago
he diameters of apples from a certain farm follow the normal distribution with mean 4 inches and standard deviation 0.4 inch. Apples can be size-sorted by being made to roll over mesh screens. First the apples are rolled over a screen with mesh size 3.5 inches. This separates out all the apples with diameters less than 3.5 inches. Second, the remaining apples are rolled over a screen with mesh size 4.3 inches. Find the proportion of apples with diameters less than 3.5 inches. Round your answer to four decimal places.
General
2 months ago
Ferric chloride is used as a flux in some types of extraction metallurgy processes. This material is shipped in containers, and the container weight varies. It is important to obtain an accurate estimate of mean container weight. Suppose that from long experience a reliable value for the standard deviation of flux container weight is determined to be 4 lb. How large a sample would be required to construct a 95% two-sided confidence interval on the mean that has a total width of 1 lb?
General
2 months ago
write the expression in a completely factored form (p+6) - p(p+6)=
General
2 months ago
Let h be the function that assigns each student ID number to a grade level.h:{student ID number} → {grade level}Assign each student ID number to the student’s current grade level.c. Jonny says, "This is not a function because every ninth grader is assigned the same range value of 9. The rangeonly has 4 numbers {9, 10, 11, 12}, but the domain has a number for every student in our school." Explain toJonny why he is incorrect.
General
2 months ago
A manufacturing company uses an acceptance scheme on production items before they are shipped. The plan is a two-stage one. Boxes of 25 are readied for shipment and a sample of 3 is tested for defectives. If any defectives are found, the entire box is sent back, for 100 percent screening. If no defectives are found, the box is shipped.Q: Now suppose the manufacturing company decides to change its acceptance scheme. Under this new scheme an inspector takes one at random, inspects it, and then replaces it in the box; a second inspector does likewise. Fianlly a third inspector goes through the same procedure. The box will not be shipped if any of the three find a defective.ANSWER THE FOLLOWING. AND PLEASE EXPLAIN IN WORDS HOW TO SOLVE THIS PROBELMa) What is the probability that a box containing 3 defectives will be shipped?b) What is the probability that a box containing only 1 defective will be sent back for screening?
General
2 months ago
According to the South Dakota Department of Health, the number of hours of TV viewing per week is higher among adult women than adult men. A recent study showed women spent an average of 40 hours per week watching TV, and men, 34 hours per week. Assume that the distribution of hours watched follows the normal distribution for both groups, and that the standard deviation among the women is 4.7 hours and is 5.2 hours for the men.a. What percent of the women watch TV less than 43 hours per week? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) Probability b. What percent of the men watch TV more than 30 hours per week? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)
General
2 months ago
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