lifeafterthebullet
Calculators
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
lifeafterthebullet
lifeafterthebullet
Home
General
Algebra
Geometry
Coordinate-geometry
Statistics
Calculus
Qna
Math
MATH SOLVE
Home
General
Seven is at most the quotient of a number d - 5.
General
4 months ago
What are the approximate values of the non-integral roots of the polynomial equation? x4 − 4x3 = 6x2 − 12x
General
4 months ago
7/8, 5/11, 2/3 leadt to greatest
General
4 months ago
Suppose you want to find the difference of two sinusoidal currents, given as follows: i1(t)=I1 cos(ωt+ϕ1) and i2(t)=I2 cos(ωt+ϕ2). If you stay in the time domain, you will have to use trigonometric identities to perform the subtraction. But if you transform to the frequency domain, you can simply subtract the phasors I1 and I2 as complex numbers using your calculator. Make sure that all of your time-domain currents are represented using the cosine function before you apply the phasor transform. Your answer will be a phasor, so you will need to inverse phasor-transform it to get the answer in the time domain. This is an example of a problem that is easier to solve in the frequency domain than in the time domain. Use phasor techniques to find an expression for i(t) expressed as a single cosine function, where i(t)=[250cos(377t+30∘)−150sin(377t+140∘)] mA. Enter your expression using the cosine function. Round real numbers using two digits after the decimal point.
General
4 months ago
The random variable X, representing the number of errors per 100 lines of software code, has the following probability distribution. x 2 3 4 5 6 f(x) 0.25 0.4 0.04 0.01 0.3 Use the following theorem to determine the variance of the random variable X. The variance of a random variable X is sigma squared equals Upper E (Upper X squared )minus mu squared.
General
4 months ago
Choose the equation that represents the graph below: (1 point)Graph of a line passing through points 0 comma 4 and 3 comma 0 y = − three fourths x + 4 y = − four thirds x + 4 y = three fourths x − 4 y = four thirds x − 4
General
4 months ago
We learned in Exercise 4.18 that about 90% of American adults had chickenpox before adulthood. We now consider a random sample of 120 American adults. (a) How many people in this sample would you expect to have had chickenpox in their childhood? And with what standard deviation? (b) Would you be surprised if there were 105 people who have had chickenpox in their childhood? (c) What is the probability that 105 or fewer people in this sample have had chickenpox in their childhood? How does this probability relate to your answer to part (b)?
General
4 months ago
GeographyHere is some information about household rubbish in 2006About 6.8 million tonnes of household rubbish is recycled.This is 27% of total household rubbishAbout 20.1 million tonnes of household rubbish could be recycledWhat percentage of household rubbish could be recycled?
General
4 months ago
Describe the possible lengths of the third side of the triangle given that the lengths of the other two sides are 2 feet and 40 inches.90 POINTS
General
4 months ago
The width of a rectangle is 19 meters more than the length. The perimeter is 242 meters. Find the length and width.
General
4 months ago
Ravi ordered some books online and spent a total of $89. Each book cost $5 and he paid a total of $4 for shipping. How many books did he buy?(a) Write an equation that could be used to answer the question above. First, choosethe appropriate form. Then, fill in the blanks with the numbers 89,5, and 4. Let brepresent the number of books.
General
4 months ago
Evaluate the Riemann sum for f(x) = 3x − 1, −6 ≤ x ≤ 4, with five subintervals, taking the sample points to be right endpoints.
General
4 months ago
What are the dimensions of the lightest open-top right circular cylindrical can that will hold a volume of 2744 cmcubed3?
General
4 months ago
Teresa has to buy school supplies for her 2 children, and wants to estimate the total cost of the school supplies. She knows that: Each child needs a backpack, a binder, 6 spirals, and 4 pens. The most expensive backpack is $57.00 dollars. The least expensive backpack is $29.00 dollars. The binders cost $4.00 each. The spirals cost $1.95 for three. The pens cost $0.48 each. There is 10% sales tax on her total purchase. Estimate how much money the school supplies will cost. A. $212.00 B. $232.00 C. $58.00 D. $116.00
General
4 months ago
Question OneFarmer Jones has 140 feet of fencing to construct a rectangular corral.If x represents the width of the corral, which function can be used to express the area A of thecorral as a function of x?AA(x) = 70.0BA(z) = 2(70 - 2)CA(x) = a(140 – 2)DA(z) = x(140 – 22)
General
4 months ago
A recent nationwide study investigated the value of the prostate-specific antigen (PSA) blood test for the detection of prostate cancer among 100,000 men 50 years of age and older. Of the 686 men who tested positive on the PSA test, a total of 281 were ultimately diagnosed with prostate cancer, either by immediate needle biopsy or during 12 months of watchful waiting. An additional 45 men who tested negative on the PSA test were ultimately diagnosed with prostate cancer during 12 months of follow-up.1) Set up the 2X2 contingency table for the data. 2) What is the sensitivity of the PSA test? Interpret the result.3) What is the specificity of the PSA test? Interpret the result.4) What is the positive predictive value (PPV) of the PSA test? Interpret the result.5) What is the negative predictive value (NPV) of the PSA test? Interpret the result.6)A screening test is available to identify individuals with a genetic mutation that puts them at greater risk for stroke. The test is extremely expensive and is not covered by most insurance plans, so those choosing to have the test usually have to pay for it out-of-pocket. However, it has been determined that the screening test is very valuable because the annual incidence of stroke among those who have been screened is nearly half that of the general population.7) One major benefit of mammography screening for breast cancer is that the disease is often diagnosed in the presymptomatic phase of the disease, before it is detectable by any other means, and breast cancers diagnosed in such early stages respond better to treatment. Another benefit of screening is that women diagnosed with breast cancer by way of mammography have better survival rates than women diagnosed by other means.8) The prognosis for neuroblastoma, a tumor that occurs in young children, varies greatly by patient. Some tumors are slow-growing and may even heal spontaneously. Others tumors are fast-growing and aggressive. A urine screening test for neuroblastoma is currently available that detects metabolites produced by the tumor. It has been suggested that such screening is highly valuable PH20001 Essentials of Epidemiology 2 because the case-fatality rate of neuroblastoma among children diagnosed with the urine test is much lower than it is for those who were not screened.9) Suppose that a new screening test has recently been developed to aid in the early identification of individuals with rheumatoid arthritis. However, the value of the test has not yet been established. In an effort to test the effectiveness of the new test in predicting a future diagnosis of rheumatoid arthritis, investigators enroll a group of volunteer participants, record their test result, and follow them forward for the development of the condition. It is subsequently determined that the new screening test is highly effective in predicting a definitive diagnosis of rheumatoid arthritis because the incidence of the condition among those who screened positive was much higher than that of the general population.10) There are at least a dozen types of human papillomaviruses (HPV) that are considered high-risk and cause approximately 5% of all cancers world-wide. However, high-risk HPV infections are common and most occur without any symptoms and resolve on their own within 1-2 years. In 2003, cervical HPV screening tests became available and are now approved for use in combination with a Pap test among women over the age of 30. Such tests can detect infection of several high-risk HPV types before cell changes become evident. Some argue that HPV screening tests should be approved for universal use among women of all ages because the incidence of high-risk HPV infections has increased dramatically over the past decade.
General
4 months ago
A pleasure boat sets out for a cruise on a river, sailing upstream 24 miles and then turning around and returning to port. The trip upstream requires 144 minutes and the trip downstream requires 40 minutes. Find the speed of the boat in still water and the speed of the current in miles per hour (mi/h). Round to the nearest whole number.
General
4 months ago
Rachel pays $131.44 for a desk, including tax. The tax is 31 cents less than 1 16 the desk's price. What is the price for the desk before adding the tax?
General
4 months ago
A publisher reports that 37% of their readers own a laptop. A marketing executive wants to test the claim that the percentage is actually different from the reported percentage. A random sample of 350 found that 30% of the readers owned a laptop. Find the value of the test statistic. Round your answer to two decimal places.
General
4 months ago
Q. You're working for a tourism company that provides travelers with a unique "View from Above"hot air balloon tour. If you have a round hot air balloon that is shaped like a ball and is 50 feet indiameter, how much air does it contain? Use 3.14 for i.
General
4 months ago
Previous
1
2
3
Next