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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

この問題教えてください🙏

DRILLS EXERCISES 1.各組の会話が成り立つように,( )内に適当な疑問詞を入れなさい. 1)( 2) ( 3) ( 4) 5) 6) (iveri 7) 8) ( ) does Mike do after school? - He plays volleyball. ) was Yuka born? - She was born in Kyoto. teaches you English? Ms. Brown does.sa bag is this? It's mine. 29m0) Smos do you like better, pizza or pasta?-I like pizza. did you get your new bike? - My uncle bought it for me. did Kate write this letter? - She wrote it last spring. did you open the window? - Because it was hot. 2. 日本語の意味に合うように( )内の語句を並べかえなさい. 1) 庭を掃除しよう. (clean, garden, let's, the) 2) 図書館では静かにしなさい. (in, be, the library, quiet) 3) あなたの自転車を貸してください. (me, lend, please, your) 4)この通りに車を停めてはいけません. (park, don't, on, your car) 3. 各文を下線部の語句を強める感嘆文に書きかえなさい. 1) I am lucky. 2srbsat 1 2) You are a lucky boy. 3) Jane plays tennis well. 4) She wrote nice songs. JUcb(s)-3600 4. 日本語の意味に合うように( )内に適語を入れなさい. 1) 昨夜は何時間寝ましたか. -) ( hours( digu)! 2) だれがこのパイを作ったのですか. 一私です。 ( ) ( 3) 小さなことから始めましょう. ) ( 4) アナはなんて親切な女の子なんだろう. ) ( ) ( you ( ) with small things. ) girl Anna is! 1 Doy DAC dlz- 4 5 bike. this street. ) this pie? - I did. an E-JAGON → 6 牛かつヨつ HOEHS**** ) last night? a(e)-3) (6 OXI 11

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英語 高校生

英表DualscopeⅡのUnit17のexerciseの答えを教えてください。

-EXERCISES A Complete the sentences with the words in brackets. (1) I liked life in Osaka best (I / lived / had / there / for / though) only two years. (2) ( even / you / join / if / the volunteer / do not) club, you can still help in the community. 4372 harde o taborn you de 300 bri (3) (what / matter / we / reason / have / no), we must not start a war. (4) Peter will not take any time off ( of / spite / order / in / his doctor's ). (5) ( of / freedom / is / speech / though / even) the basis of democracy, few people understand what it means. (6)( not / whether / or / computers / like / we ), we cannot imagine life without them. une lis 10 1390.in B Fill in the blanks to complete the dialogs. (1) Satoshi: You've lived in Japan for three years. Have you ever been to Kyoto? Olivia: Yes, of course. I always find something new N 京都でどこを訪れても (2) George: Takeshi seems to have overslept and missed the nine o'clock train! Mika: Oh, no! He won't be on time for the ceremony たとえ飛行機で来ても (3) Kate: Is that man your tennis coach? Fred: Yes. He will be seventy next month, but he is still active He jogs five kilometers every morning. Let's Try ! ALLA sd Illw #2910x3 C Express the following in English. (1)たとえ政治に興味がなくても、選挙権をもつ人は投票しなければならない. (2) 結婚で仕事を辞める女性もいるが,最近ではより多くの女性が定年まで仕事を続ける . _________: 彼の年齢にもかかわらず InT [retirement age ] (3)優先座席であろうとなかろうと,いつも自分の席をお年寄りに譲っている.〔priority seat〕 (4)ユニバーサルデザインの普及にもかかわらず,障がいのある人々が街を動き回るのはいまだに 困難だ.〔universal design, disabled people〕 (5)日本は高齢化が急速に進んでいるにもかかわらず,老人ホームの数が十分ではない。 [nursing home]

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