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An ellipse has a center of (3, 1), a focus of (8, 1), and a directrix of x = 36.8. Which is the equation of the ellipse?
General
2 months ago
An electrician charges $120 after 2 hours of work and $190 after 4 hours of work.Write a linear model that represents the total cost as a function of the number of hours worked.What is the electrician fee. How much does the electrician charge per hour
General
2 months ago
The mills at a carpet company produce, on average, one flaw in every 500 yards of material produced; the carpeting is sold in 100-yard rolls. If the number of flaws in a roll follows a Poisson distribution and the quality-control department rejects any roll with two or more flaws, what percent of the rolls are rejected?
General
2 months ago
Trains headed for destination A arrive at the train station at 15-minute intervals starting at 7:00 am, whereas trains headed for destination B arrive at 12-minute intervals starting at 7:07 am. If a passenger arrives at the station at a time uniformly distributed between 7:00 am and 8:00 am and then gets on the first train that arrives, what proportion of time does the passenger go to destination A? a. 0.43 b. none of the answers provided here c. 0.53 d. 0.67e. 0.37
General
2 months ago
To estimate the mean height μ of male students on your campus,you will measure an SRS of students. You know from government datathat heights of young men are approximately Normal with standarddeviation about 2.8 inches. You want your sample mean x to estimateμ with an error of no more than one-half inch in eitherdirection.(a) What standard deviation must x have so that 99.7% of allsamples give an x within one-half inch of μ?(b) How large an SRS do you need to reduce the standard deviationof x to the value you found in part (a)?
General
2 months ago
The North Carolina Aquarium at forth fisher celebrated a record amount of visitors on Memorial Day.they recorded 16,652 visitors.how many times greater is the 6 in the thousands place than the 6 in the hundreds place? A.100. B.10. C.1,000 d.10.000
General
2 months ago
A researcher is interested in the cholesterol levels of adults in the city in which she lives. A free cholesterol screening program is set up in the downtown area during the lunch hour. Individuals can walk in and have their cholesterol levels determined for free. One hundred and seventy three people us the service, and their average cholesterol is 217.8. The sample obtained is an example ofa. a simple random sample, since the experimenter did not know beforehand which individuals would come to the screening.b. a stratified sample of high and low cholesterol individuals.c. a sample probably containing bias and undercoverage.d. a multistage sample of varying cholesterol levels.
General
2 months ago
A jar contains four coins: a nickel, a dime, a quarter, and a half-dollar. Three coins are randomly selected from the jar. (a) What is the probability that the selection will contain the half-dollar? (Enter an exact number as an integer, fraction, or decimal.)
General
2 months ago
Suppose the probability of producing a defective light bulb from a production line is the same over an interval of 90 minutes. Which of the following distributions would you use to determine the probability that a defective light bulb will be produced in a 15-minute interval? A) Normal distribution B) Poisson distribution C) Uniform distribution D) Exponential distribution
General
2 months ago
If the distribution of the population has a nonzero standard deviation and mean 10 then the probability that an individual data value will be greater than 11 is always less than the probability that the mean of 25 randomly selected data values will be greater than 11TRUE OR FALSE?
General
2 months ago
Giuliana has 22 quarters and dollar coins worth a total of $10.75.Which equation can be used to find d, the number of dollar coins Giuliana has?d – 22 + 0.25d = 10.750.25d + 22 – d = 10.750.25(22 – d) + d = 10.75d + 0.25(d – 22) = 10.75
General
2 months ago
Describe the transformation required to obtain the graph of the given function from the basic trigonometric graph. y=csc (x) - 9a.Vertical translation up 9 unitsc.Vertical stretch by a factor of 9b.Horizontal translation to the right 9 unitsd.Vertical translation down 9 units
General
2 months ago
Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number please help
General
2 months ago
Mrs. Robinson bought a novel at the bookstore on sale for 20% off at regular price of 2909 mr. Chang what the same novel the different books are 40% of its regular price of $25 which person receive the better discount
General
2 months ago
Mr. Venn knows that 60% of his students will score no more than 5 points above or below the class average,75% on the test.Write an inequality that represents the test scores of 60% of his students?
General
2 months ago
Use rigid motions to explain whether the triangles in the figure are congruent. Be sure to describe specific rigid motions in your explanation.
General
2 months ago
An online retailer sells two packages of protein bars. Package 10−pack of 2.3 ounce bars 12−pack of 1.6 ounce bars Cost ($) 17.35 16.97 Which package has the better price per bar?
General
2 months ago
If sinθ = -1/2 and θ is in Quadrant III, then tanθ = _____.
General
2 months ago
What is the quotient (2x3 − 3x2 − 14x + 15) ÷ (x − 3)?a. 2x2 + 3x − 5b. 2x2 − 3x + 5c. 2x2 − 3x − 5d. 2x2 + 3x + 5
General
2 months ago
Choose the value of X that makes the open sentence true 30 - x^2 < 3x + 7 A 4B 3C 2D 1
General
2 months ago
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