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英文 高中

請問第四題如果選D的話合理嗎?覺得蠻通順的 謝謝!

II. 綜合測驗 With all the TED Talks available, how can you choose a good one to start with? TED.com offers several playlists that can introduce you to TED Talks. 1. playlist* features the 25 most-watched talks. Another, 2. "11 must-see TED Talks," aims to give an introduction to the wide range of topics covered. Still another has 3. of the very first talks to be uploaded. 4. , you might start with the one talk that is on all three lists: Sir Ken Robinson's "Do Schools Kill Creativity?" This talk 5. is from 2006, is about encouraging creativity in school. TED's most popular talk, it 6. more than 58 million times over the years. Talks also bed The 563.6 Talk. Eve miss one 1₁. online. T even if y If you still don't know 7. a talk, try TED.com's TED Recommends* system. Using jetoi sii ni sau tot jelewater at slytestil vibaori-pos nseil. some topics you find interesting. 9. with that this is very easy. All you have to do is 8. information, the system recommends a talk for you to watch and rate. After you watch that first 5021 (8) muntari A talk, a second is recommended based on your rating. 10. you watch and rate, the system learns your preferences* and can suggest more and more interesting talks for you. However you choose your first video, TED Talks can be so interesting that it probably won't be your last. 註*: playlist 播放清單;recommend 推薦;preference 偏好 註*:re 1. 6. (B) One coronal THC (C) Another (D) Other ( IV. 篇重 (B)1. ) 1. (A) Some s ohni T (B) known for (C) known as (D) known to (A) S (V) 2. (A) known by Say It (8) do (C) little SURMA) (D) a little st (B) a few B) 3. (A) few ( () 4. (A) In fact commemo (B) In other words (D) However 1 blowodi 10ei (C) Instead blow od si notlesinagio C (C) that (B), which (D), who (^) which bos HO(A) sl odi omr 978l odi Every videos all also launc follow the local focu (B) C in (C) T

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數學 高中

求救第55題 完全看不懂他要我幹嘛

Year slenue Req) = 1932 1958 +1000 q R 9)=-1000q =74 1963 1968 COM If the price in dollars of a stereo system is given by 1000 p(q) + 1000, 1000 ² q where q represents the demand for the product, find the mar- ginal revenue when the demand is 10. 54. Profit Suppose that for the situation in Exercise 53 the cost in dollars of producing a stereo systems is given by C(q) = 0.2q2 + 69 + 50. Find the marginal profit when the demand is 10. 59. Marginal Product of Labor The output y of a manufacturing y process is a function of the size of the labor force n using the function 1990 +1000 1971 1974 = 990 197 197 19 19 1 y = kVn. The marginal product of labor, defined as dy/dn, measures the rate that output increases with the size of the labor force, and is a measure of labor productivity. (a) Show that (c) Using the a cubic f respond the rate and 200 (d) Discus descri part ( the y (e) Exp data calc ful x C(x) = 58. Money 1955-7 dy k dn an (b) How can you tell from your answer to part (a) that as the size of the labor force increases, the marginal product of labor gets smaller? This is a phenomenon known as the law of diminishing returns, discussed more in the next chapter. 56. Profit An analyst has found that a company's costs and rev- enues in dollars for a product are given by x2 C and R(x) 2x 2 5000' respectively, where x is the number of items produced. (a) Find the marginal cost function. (b) Find the marginal revenue function. (c) Using the fact that profit is the difference between revenue and costs, find the marginal profit function. (d) What value of x makes the marginal profit equal O? (e) Find the profit when the marginal profit is 0. (As we shall see in the next chapter, this process is used to find marimum profit.) A wher in bi find year (a) (C) (e) nad since

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