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数学 高校生

赤く丸をしたbの問題で解答の方に二階微分した後の式がなぜ(-1/4)(-1/4)(H-27)になるのか分かりません。教えてください🙇‍♀️

QA At time t = 0, a boiled potato is taken from a pot on a stove and left to cool in a kitchen. The internal temperature of the potato is 91 degrees Celsius (°C) at time t = 0, and the internal temperature of the potato is greater than 27°C for all times t > 0. The internal temperature of the potato at time t minutes can be modeled by the function H that satisfies the differential equation dH (H- (H-27), where H(t) is dt measured in degrees Celsius and H(0) = 91. (a) Write an equation for the line tangent to the graph of Hat t = 0. Use this equation to approximate the internal temperature of the potato at time t = 3. (b) Use 2017 APⓇ CALCULUS AB FREE-RESPONSE QUESTIONS (a) dH d²H dt² to determine whether your answer in part (a) is an underestimate or an overestimate of the internal temperature of the potato at time t = 3. (c) For t < 10, an alternate model for the internal temperature of the potato at time 7 minutes is the function -= − (G - 27)²/3, where G(t) is measured in degrees Celsius dG G that satisfies the differential equation dt and G(0) = 91. Find an expression for G(t). Based on this model, what is the internal temperature of the potato at time t = 3 ? 564 at (21-27) - == 2-16 To = - = (H(3)-27) 4 -64 = HB)-27 -37 = H (3) (b) _d²fi © 2017 The College Board. Visit the College Board on the Web: www.collegeboard.org. GO ON TO THE NEXT P

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英語 高校生

UNITE STAGE2のLesson11です。 2️⃣と5️⃣と7️⃣を教えてください💦

Reading 00000000000000 Read the passage and answer the questions. The number of foreign tourists to Japan is increasing every 60 year. In 2016, over 20 million people visited Japan for sightseeing. Many of the visitors come from Asian countries near Japan. These tourists enjoy Japan's unique food, traditional buildings, 5 and natural scenery. But the Japanese government wants even more tourists to come. They started a plan to encourage tourists to visit the country more than once. First, the government asked tourists what they want to do during their first visit. Eating Japanese food is the most popular 10 activity. The least popular is skiing. Next, they asked them what they want to do on a second visit. The research shows that few tourists want to do the same activities again, such as eating Japanese food. However, skiing and snowboarding, and nature tours are more attractive for second time visitors than first- 15 timers. The biggest increase is in seasonal experiences, such as seeing cherry blossoms in the spring or falling leaves in the autumn. Clearly, foreign tourists want to experience something new and unique for their second visit. Things foreign tourists want to do in Japan 100 80 60 40 20 0 96.4. 58 ア -75.3- 46.8 87.4 47.6 visiting famous shopping places 3.1 18.2 This time in Japan DAS S Next trip to Japan 7.4 .16.2. nature tour / visiting farms and fishing ports 60-62 12.2 32.1¯ These results are very useful for 61 tour companies. They now 20 make 3 unique tours for foreigners. Some companies even provide tours to schools, farms, and fishing ports. On these tours, visitors from all over the world can enjoy many activities. They can enjoy communicating with Japanese people too. They will surely visit Japan many times. (229 words) 44 QHints scenery (si:nari seasonal [sizan cherry blossom bli 桜の花 fishing port

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英語 高校生

エレメント2のレッスン6のComprehensionとVocabularyの答え教えてください

96 Comprehension Life 2. Bruce Edwards changed A Reading for main ideas: Choose the best answer. 1. What is the main idea of the passage? a The development of the role of caddies. bThe fighting spirit necessary for athletes. The friendship between a golfer and a caddy. B Reading for details: Fill in the blanks with the words in the box below. There a unnecessary words. Then divide the paragraphs into the following sections. 11 9 3 4 5 16 Caddy for Life 1 2 8 10 a the way people saw caddies b his career from a golfer to a caddy golf courses so that golfers could play safely There was a very (1. ) caddy called Bruce Edwards. ) from high school, he started to work for Tom Watson as a Caddies used to just carry the golf bag for golfers, but Bruce always (3. After Bruce (2. condition of the course. Bruce was also not afraid to (4. ) with the golfer. ), Watson wanted to play less, so Bruce decided to work for Greg After many (5. Bruce missed Watson, and he decided to return to Watson after three years ( After they started to play together again, Bruce began to have some (7. Bruce was (8. ) with ALS, but he continued to caddy for Watson. ) at the US Open. Introduction Becoming Watson's caddy ( Separation and reunion Deadly diagnosis ( The last chance together in the spotlight ( Epilogue ) ) ) Vocabulary A Choose the correct definition 1. What's the distance from 2. I'm glad we have this opp 3. It was heartbreaking to 4. My aunt was taken to hos 5. His name now became a making you (b) the amount an unimpo d a chance to relating to C Listening for details: Listen to the statements and answer T(true) or F(false). 1.( ) 2. ( ) 3. ( ) 5. ( ) 4. ( Both Watson and Bruce (9. 2. Could you move over Watson and Bruce knew this could be their last time together in the (10. Could you move ou Watson asked for (11. ) to do more research on ALS, and Bruce w 3. They sat down and t ) for having someone like Watson with him. (12. They sat down an Paragraph Organization ) B Choose the correct word for 1. She strongly (disagree 2. Is there a (direct / dir Words diagnosed / disagree / exam funding/special/sorro separation /health/spoti thankful/graduated victories / weaker/appea D Retelling the story: Look at the pictures on pages 92-93, and retell the story. 3. He was (desperate / d- C Fill in the blanks to rephra 1. The teacher is now co- The teacher is now - 4. If you really want th If you really want 5. He finally admitted He finally ( - Tips caddy caddy は caddie と綴られる for a golfer)」を意味するとと caddy for a golfer)」 という意 として使えるかどうかをまず推

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