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question:Cape May has 8 more than twice as many sharks as Daytona Beach. If Daytona Beach has 12 sharks, how many sharks are there in Cape May?
answer:To solve this problem, we start by calculating twice the number of sharks in Daytona Beach. Since Daytona Beach has 12 sharks, we multiply this number by 2: [12 times 2 = 24] This means twice the number of sharks in Daytona Beach is 24. Next, since Cape May has 8 more sharks than twice the number of sharks in Daytona Beach, we add 8 to this number: [24 + 8 = 32] Therefore, the number of sharks in Cape May is boxed{32}.
question:Among the descriptions of the functions of the digital Earth, the correct one is ( ) A: It has functions such as information acquisition, transmission, reception and processing, analysis, and application. B: It has functions such as managing, querying, updating, spatial analysis, and application evaluation of geographic information data. C: It integrates a large amount of information of different spaces and times, both natural and human, according to geographic coordinates, from regional to global, and displays it in a threedimensional and dynamic way. It can provide experimental conditions and test bases for complex production and research activities. D: It has the spatial positioning function of geographic information.
answer:**Analysis:** The content of option A is the function of remote sensing; the content of option B is the function of the Geographic Information System (GIS); the content of option D is the function of the Global Positioning System (GPS); therefore, the correct answer is boxed{text{C}}. **Review:** This question examines the functions of the digital Earth; using the digital Earth in computers can simulate and emulate various processes, patterns, impacts, and countermeasures of global changes, thereby enhancing humanity's ability to cope with global changes.
question:Among the following numbers, the one that does not have a square root is: A: 4 B: 0 C: 0.5 D: 2
answer:To determine which of the given numbers does not have a square root, we must understand the basic principle that negative numbers do not have real square roots, while non-negative numbers (including zero and positive numbers) do have real square roots. Let's examine each option: - **Option A: -4** Negative numbers do not have real square roots in the real number system. Since -4 is a negative number, it does not have a real square root. - **Option B: 0** The square root of 0 is 0 itself, because 0^2 = 0. Therefore, 0 has a square root. - **Option C: 0.5** Positive numbers have real square roots, and 0.5 is a positive number. Therefore, 0.5 has a square root. - **Option D: 2** Like 0.5, 2 is a positive number and thus has a real square root. Given the above analysis, the number that does not have a square root among the options is -4. Therefore, the correct answer is: boxed{A}
question:The circumference of a circle is divided into n equal parts. At the endpoints of each part, quartercircles are constructed using each segment as radius. Determine the total length of these quartercircles as n approaches a large value. A) frac{pi C}{2} B) pi C C) frac{C}{2} D) 2pi C E) C
answer:1. **Define the original circle's properties**: Let the circumference of the original circle be C. The full circle's radius, R, can be defined using C = 2pi R. 2. **Divide the circumference into n equal parts**: Each segment of the circle is frac{C}{n} and serves as the radius for the quarter-circles. 3. **Determine the circumference of each quarter-circle**: The circumference of a full circle with radius frac{C}{n} is 2pi frac{C}{n}. Because only a quarter of the circle is used, the circumference of one quarter-circle is frac{2pi frac{C}{n}}{4} = frac{pi C}{2n}. 4. **Sum the circumferences of all quarter-circles**: There would be two quarter-circles at each of the n segments, amounting to 2n quarter-circles. The total length of the arcs is: [ 2n times frac{pi C}{2n} = pi C ] 5. **Comparison**: The sum of these quarter-circle arc lengths is pi C, which interestingly is equal to the full circumference of the original circle. Conclusion: Therefore, as n becomes very large, the total length of the arcs constructed from quarter circles equals: pi C The final answer is boxed{textbf{(B)} , pi C}