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A student is trying to solve the system of two equations given below:Equation P: y + z = 6Equation Q: 5y + 92 = 1Which of the following is a possible step used in eliminating the y-term?Please help, i’ll give you brainliest :)
General
4 months ago
Use the tree diagram from example 9 in the task. What is the probability that a student will make EXACTLY a 50% on the true/false test?Group of answer choices1/163/81/41/2Flag this QuestionQuestion 21 ptsUse the tree diagram from example 10 in the task. What is the probability that a student will get all the answers wrong? Group of answer choices1/1681/2561/21/8Flag this QuestionQuestion 31 ptsUse the example from question 11 on the task. What is the probability that a student would pass the quiz (80 or 100). Group of answer choices0.00640.000320.006720.40
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4 months ago
Supposed that over a period of several years the average number of deaths from a certain noncontagious disease has been 5. If the number of deaths from this disease follows the Poisson distribution, what is the probability that during the current year: (e −1 = 0.37, e−2 = 0.14, e−3 = 0.05, e−4 = 0.02, e−5 = 0.01) (a) There will be no deaths from the disease? (b) Two or more people will die from the disease?
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4 months ago
ActiveTIME REMAINING01:59:33Alberto uses the steps below to solve the equationWhich justifies Step 6 of his work?3* - 3 =the addition property of equalitythe identity property of additionthe multiplication property of equalitythe identity property of multiplicationStep 1:x - 3 + 3 = 7 + 3Step 2:=x + 0 = 10Step 3:x =Step 4: 2(_)* = 2(10)Step 5: 1x = 20Step 6: x = 20
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4 months ago
Vincent and Jean are two cooks who work in a village. Each of them can either bake cakes or make pizzas. Every ingredient is readily available to them, and the only scarce resource is the cooks' time. Vincent can bake 10 cakes or make 5 pizzas in an hour. Jean can bake 12 cakes or make 8 pizzas in an hour. Please answer the four questions. 1 . Which cook has the absolute advantage in baking cakes? Vincent Neither Jean 2 . Which cook has the absolute advantage in making pizzas? Vincent Neither Jean 3 . Which cook has the comparative advantage in baking cakes? Vincent Neither Jean 4 . Which cook has the comparative advantage in making pizzas? Vincent Jean Neither
General
4 months ago
After observing this pattern, Lexie made a conjecture for the next shape in the pattern. Five squares in a row. Each square has a segment extending from its center to a vertex of the square. In the first square, the segment extends to the top left. In the second square, the segment extends to the top right. In the third square, the segment extends to the bottom right. In the fourth square, the segment extends to the bottom left. In the fifth square, the segment extends to the top left. Which shape was most likely her conjecture for the next shape?
General
4 months ago
How long did real cowboys live? One answer may be found in the book The Last Cowboys by Connie Brooks (University of New Mexico Press). This delightful book presents a thoughtful sociological study of cowboys in West Texas and Southeastern New Mexico around the year 1890. A sample of 32 cowboys gave the following years of longevity: 58 52 68 86 72 66 97 89 84 91 91 92 66 68 87 86 73 61 70 75 72 73 85 84 90 57 77 76 84 93 58 47 (a) Make a stem-and-leaf display for these data. (Use the tens digit as the stem and the ones digit as the leaf. Enter numbers from smallest to largest separated by spaces. Enter NONE for stems with no values.) Longevity of Cowboys
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4 months ago
Alice's take-home pay last year was the same each month, and she saved the same fraction of her take-home pay each month. The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take-home pay that she did not save. If all the money that she saved last year was from her take-home pay, what fraction of her take-home pay did she save each month?a/ 1/2b/ 1/3c/ 1/4d/ 1/5e/ 1/6
General
4 months ago
A linear function can be used to estimate the decrease in snowfall measured since 1920. The decrease in the annual snowfall has been on average 0.24 inches per year. Let x represent the number of years since 1920, when the measurements began, and let y represent the annual snowfall. The initial measurement in 1920 was 48.6 inches. Using the average change and initial measurement, which is the best estimate of the annual snowfall in the 78th year after records were kept? Round to the nearest hundredth.
General
4 months ago
Tom and Linda stand at point A. Linda begins to walk in a straight line away from Tom at a constant rate of 2 miles per hour. One hour later, Tom begins to jog in a straight line in the exact opposite direction at a constant rate of 6 miles per hour. If both Tom and Linda travel indefinitely, what is the positive difference, in minutes, between the amount of time it takes Tom to cover the exact distance that Linda has covered and the amount of time it takes Tom to cover twice the distance that Linda has covered?A. 60B. 72C. 84D. 90E. 108
General
4 months ago
Steven just got a new summer job painting fences in his neighborhood. He will be paid $7.25 an hour. His first customer paid him a total of $36.25.Part A:If h = the number of hours Steven worked, write an equation that would show how the customer knew how much to pay him.Part B:Using the equation you wrote in Part A, how many total hours did Steven work?(Explain in detail please.)
General
4 months ago
The sum of two consecutive integers is 123 what’s is the smallest of the two integers
General
4 months ago
Compute the second partial derivatives ∂2f ∂x2 , ∂2f ∂x ∂y , ∂2f ∂y ∂x , ∂2f ∂y2 for the following function. f(x, y) = 2xy (x2 + y2)2 , on the region where (x, y) ≠ (0, 0) Verify the following theorem in this case. If f(x, y) is of class C2 (is twice continuously differentiable), then the mixed partial derivatives are equal; that is, ∂2f ∂x ∂y = ∂2f ∂y ∂x .
General
4 months ago
Your co-worker, Amanda, and you are reliving your high school athletic "glory days" during a coffee break. She played basketball and you played baseball. Amanda scored 16 points per game and you had a .325 batting average. You are trying to see who had the better athletic career (statistically speaking), but you can’t compare basketball stats to baseball stats. Use z-scores to convert her points per game average and your batting average. What are the scores and who had the better athletic career? Assume that the mean points per game for basketball players during Amanda’s career was 15 points per game with a standard deviation of 4. Also, the batting average for baseball players during your high school career was 310 (i.e., .310) with a standard deviation of 25.
General
4 months ago
The Nelson Company makes the machines that automatically dispense soft drinks into cups. Many national fast food chains such as McDonald's and Burger King use these machines. A study by the company shows that the actual volume of soft drink that goes into a 16-ounce cup per fill can be approximated by a normal model with mean 16 ounces and standard deviation 0.31 ounces. A new 16-ounce cup that is being considered for use actually holds 16.62 ounces of drink.a. What is the probability that a new cup will overflow when filled by the automatic dispenser? .0228b. The company wishes to adjust the dispenser so that the probability that a new cup will overflow is .006. At what value should the mean amount dispensed by the machine be set to satisfy this wish? [ looking for help with this answer ] ounces. (Use 2 decimal places in your answer and use 0.31 ounces for the standard deviation).
General
4 months ago
he American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 45 who smoke. Step 2 of 2: Suppose a sample of 830 Americans over 45 is drawn. Of these people, 631 don't smoke. Using the data, construct the 85% confidence interval for the population proportion of Americans over 45 who smoke. Round your answers to three decimal places.
General
4 months ago
Consider the following hypothesis test:H0: u u is less than or equal to 50Ha: u > 50A sample of 60 is used and the population standard deviation is 8. Use the critical value approach to state your conclusion for each of the following sample results. Use = .05.a. With ?? x = 52.5, what is the value of the test statistic (to 2 decimals)?Can it be concluded that the population mean is greater than 50?b. With ?x? = 51, what is the value of the test statistic (to 2 decimals)?Can it be concluded that the population mean is greater than 50?c. With ?x? = 51.8, what is the value of the test statistic (to 2 decimals)?Can it be concluded that the population mean is greater than 50?
General
4 months ago
Let X represent the full height of a certain species of tree. Assume that X has a normal probability distribution with mean 36.4 ft and standard deviation 39.6 ft.You intend to measure a random sample of n=97 trees. The bell curve below represents the distibution of these sample means. The scale on the horizontal axis is the standard error of the sampling distribution. Complete the following, correct to two decimal places.μ¯x = ________.σ¯x = ________.
General
4 months ago
A professor wanted to find a linear model that relates the number of hours a student plays video games each week, h, to the cumulative grade point average G of the Hours of Video Games student. He obtained a random sample of 10 full-time students at his college and asked each student to disclose the number of hours spent playing video games and per Week, h the student's cumulative grade-point average. Complete parts (a) through (1) below. Grade point Average, G 3.69 285 3.54 262 2.99 NNNNN1. Explain why the number of hours spent playing video games is the independent variable and cumulative grade-point average is the dependent variable. Choose the correct answer below. A. The number of hours is being used to predict Cumulative grade-point average .B. Cumulative grade-point average is being used to predict the number of hours.C. The number of hours and the cumulative grade-point average are unrelated.D. The number of hours is directly related to the cumulative grade-point average.
General
4 months ago
You and your friend are comparing two loan options for a $165,000 house. Loan 1 is a 15-year loan with an annual interest rate of 3%. Loan 2 is a 30-year loan with an annual interest rate of 4%. Your friend claims the total amount repaid over the loan will be less for Loan 2. Is your friend correct? Justify your answer.
General
4 months ago
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