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MATH SOLVE
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Each book on a certain shelf is labeled by a single category. For every 2 history books, there are 7 fantasy books and for every 3 fantasy books, there are 5 reference books. If the proportion of history to reference books is doubled, while the proportion of fantasy to reference books is maintained, which of the following could be the number of history books if there are fewer than 60 fantasy books on the shelf after the changes?A. 6B. 21C. 24D. 35E. 36
General
2 months ago
A curious student in a large economics course is interested in calculating the percentage of his classmates who scored lower than he did on the GMAT; he scored 490. He knows that GMAT scores are normally distributed and that the average score is approximately 540. He also knows that 95% of his classmates scored between 400 and 680. Based on this information, calculate the percentage of his classmates who scored lower than he did?
General
2 months ago
What is the solution to the square root of 4 plus the square root of 5?
General
2 months ago
Nola hiked down a trail at a steady rate for 10 minutes. Her change in elevation was -200 feet. Then she continued to hike down for another 20 minutes at a different rate . Her change in elevation for this part of the hike -300 feet. During which portion of the hike did she walk down at a faster rate? Explain your reasoning
General
2 months ago
A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours. To test this claim, a reputable testing firm took a random sample of 100 bulbs and life tested them. The testing firm found the average life of the sample to be 4500 hours with a sample standard deviation, s = 400 hours. The value of the test statistic for this problem isA 1.25B -1.25C 12.5D -12.5E None of the values listed
General
2 months ago
It is expected that gas prices will rise to be 142% of the current amount. If the current gas price is $4 per gallon, explain how to estimate the expected price of gas
General
2 months ago
In 1967, New Zealander Burt Munro set the world record for an Indian motorcycle, on the Bonneville Salt Flats in Utah, with a maximum speed of 183.58 mi/h. The one-way course was 5.00 mi long. Acceleration rates are often described by the time it takes to reach 60.0 mi/h from rest. If this time was 4.00 s, and Burt accelerated at this rate until he reached his maximum speed, how long did it take Burt to complete the course ?
General
2 months ago
A student takes a multiple choice test with 40 questions. The probability that a student answers a given question correctly is 0.5, independent of all other questions. The probability that the student answers more than N questions correctly is greater than 0.10. The probability that the student answers more than N+1 questions correctly is less than 0.10. Calculate N using normal approximation with continuity correction. Answer is 23. Please explain your work.
General
2 months ago
(Algebra II) extra points!!Find the value of y for a given value of x, if y varies directly with x.If y = -252 when x = 84, what is y when x = 74?Please explain/show your work if you canEverything helps!! Giving brainliest!! TIA:)
General
2 months ago
You can determine the approximate temperature in degrees Fahrenheit by counting the number of times a cricket chirps in one minute. Then multiply that by 7, divide by 30, and add 40. a. Write a formula for estimating the temperature based on the number of cricket chirps. b. Write a new formula for the number of chirps you would expect in one minute at a given Fahrenheit temperature. c. Use the formula to find the number of chirps in one minute when the temperature is 89°F.
General
2 months ago
A boat at anchor is bobbing up and down in the sea. The vertical distance, y, in feet, between the sea floor and the boat is given as a function of time, t, in minutes, by y=15+sin(2πt). (a) Find the vertical velocity, v, of the boat at time t. (b) Make rough sketches of y and v against t.
General
2 months ago
the equation y=15x can be used to determine the amount of money y pauli's pizzeria makes by selling x pizzas . the graph shows the money leo's pizzeria takes in for different numbers of pizzas sold. which pizzeria makes more money per pizza
General
2 months ago
The height to the base of an isosceles triangle is 12.4m, and its base is 40.6m. What are the measurement of the angles of the triangle and the length of its legs?*m is meters
General
2 months ago
Which of the following best describes the equation below? y= -3x-6 A) both linear and nonlinear B) non linear C) neither linear nor nonlinearD) linear
General
2 months ago
A lightbulb company has factories in two cities. The factory in city A produces two-thirds of the company’s lightbulbs. The remainder are produced in city B, and of these, 1% are defective. Among all bulbs manufactured by the company, what proportion are not defective and made in city B?
General
2 months ago
A master student is planning to take a qualifying exam in the coming summer. She has three chances. The first one is in June. If she fails the 1st one, then she can have a 2nd try in July, and if she also fails that one, she will take the 3rd one in August. If she fails all three exams, then she is not qualified. The chance of passing the 1st one is 0.5, the chance of passing the 2nd one is 0.7, and the chance of passing the 3rd one is 0.8. And these chances are independent. a) What is the probability that she passes the qualification? b) Given that she passes the qualification, what is the conditional probability that she passes on the second try?
General
2 months ago
Which of the following about the normal distribution is not true? (A) Theoretically, the mean, median, and mode are the same. (B) Its parameters are the mean, mu, and standard deviation, sigma. (C) About two thirds of the observations fall withinplus or minus1 standard deviation from the mean. (D) It is a discrete probability distribution.
General
2 months ago
A study found that when presented with prints from the same individual, a fingerprint expert will correctly identify the match 92% of the time. In contrast, a novice will correctly identify the match 75% of the time. Consider a sample of five different pairs of fingerprints, where each pair is a match.A) What is the probability that an expert will correctly identify the match in all five pairs of fingerprints?B) What is the probablity that a novice will correctly identifity the match in all five pairs of fingerprints?
General
2 months ago
What is the solution to the following system of linear equations?4y − 36 = −12x3x + y = −9
General
2 months ago
Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the health care system. The president wants the estimate to be within 0.03 of the true proportion. Assume a 90% level of confidence. The president's political advisors estimated the proportion supporting the current policy to be 0.06.a. How large of a sample is required? (Round up your answer to the next whole number.)
General
2 months ago
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