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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

至急!!!この問題が分かりません! わかる人教えください!問1から問10までお願いします🙏

Unit 2 長文問題Ⅱ ミツバチは女社会? 1 Have you ever experienced a bee sting? If you have, you may (1) not be fond of bees. However, they are very interesting and honeybee society is very similar to ours. Let's look at some interesting facts about it. 2 Honeybees live together in groups of 20,000-80,000 in a beehive. This group is call] a colony and the bees in the hive can be categorized into three types: a single queen, tens of thousands of worker bees and hundreds of drones. 3 A queen bee's job is to lay eggs all her life. Each day the queen bee lays around 2,000 eggs. The average lifespan of a queen is three to four years. Does the queen "rule" the colony? No. Her duty is simply egg- laying. In fact, the queen bee has a smaller brain than a worker bee. Target ①現在完了形 現在完了進行形 ② 名詞・冠詞 人称代名詞 ③ 受け身 (6) sting 刺すこと,~を刺す be fond of lifts honeybee ミツバチ be similar to ~に似ている beehive ハチの巣 colony コロニー categorize ~を分類する tens of thousands of 何万もの〜 drone 雄バチ lay eggs 卵を産む lifespan (5) 4 The worker bees are the largest population in the hive. They are all female bees but can't lay eggs. A worker bee's life is rather short. They live around 40 days. Their job is to keep the queen bee happy. They do all the work but change jobs as they grow. For about a week after birth, they mainly clean the hive. Sometime between five to sixteen days after birth, they usually take care of the babies and help to build the hive. When they become twelve to eighteen days old, they carry food. After that, they guard the hive entrance. When they are three weeks old, they fly out the hive, pollinate plants and collect food. If you're a drone bee, life is hard. You're [ bear ], live for a month or two, and then die. During that time, you're not a productive member of the hive-you can't collect pollen or help to look after eggs, like worker bees-and you can't even sting anyone. Drone bees live with one thing in mind: mating with a queen. When they're lucky, they (7) can, but they die soon after that. 5 (8) 6 Every bee in the hive has a part to play in the survival and success of their kind. Bees have been living like this for ages. They work together and live in harmony. rule ~を統治する duty. female 雌の rather かなり as ~につれて guard 守る pollinate 授粉する productive pollen E Poj (2) C (7) in mind 考えて mate with ~と交尾する success, ** in harmony 問 1 調和して、仲良く PLE (4 (E

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英語 高校生

1枚目→長文 2枚目→自分の回答 2枚目の私がまちがえているところについて解説していただきたいです。 長文も読解してもらわないといけなくなるので大変だと思いますがよろしくお願い致します☺︎

英文フレーズリーディング devenovls der 1段落契約農家は過去に発見された種の中から都合のよい種だけを選択して栽培や飼育をしている。(40字) ① Over the centuries,/ farmers have discovered thousands of different species of food crops. // ② Each species has 農家は何千もの異なる食用作物の種を発見してきている 何世紀にもわたって それぞれの種は特別 special qualities. // ③Some can be grown / in very hot or cold climates.// ④ Others are not affected / by certain 育つことができるものもある 非常に暑いまたは寒い気候で な品質をもっている 他の種は影響を受けない 特定の病気の diseases. // ⑤ However,/ you won't find many of these species / in your local supermarket // ⑥ To feed the seven しかし これらの種の多くを見つけることはできない 地元のスーパーマーケットでは 地球上の70億人を養 billion people on Earth,/ most farmers today are growing only species of plants / and farming only species of animals / うために 今日ほとんどの農家は植物の種のみを栽培したり 動物の種だけを飼育している that are easy to produce in large numbers.// ⑦Meanwhile, / thousands of other species are becoming extinct.// 大量生産しやすい 一方では 他の何千もの種が絶滅しつつある 12 段落要約 フィリピンの米や中国の小麦のように、 生き残っている種のほうが少ない。 (34字) ⑧ For example, / in the Philippines, / there were once thousands of varieties of rice; / now fewer than 100 are grown たとえば 今ではそこで栽培されているのは100種 フィリピンには かつて数千種類の米があった there. // ⑨ In China,/ 90 percent of the wheat varieties/ grown just a century ago / have disappeared. // ⑩0Experts 中国では小麦の品種の90%が もない ちょうど1世紀前に栽培された 姿を消している 専門家は考 believe / that over the past century,/ we have allowed more than half of the world's food varieties to disappear.// えている 過去1世紀で 世界の食用品種の半分以上が消滅していると

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