皆さんはノートを撮る時なんのアプリを使っていますか？

解答と理由を教えてください。わかる限りでいいので

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2.4.6の答えわかる方いますか？汗

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この長文の1部の訳を教えて欲しいです🙇

ars ago,he already had four small children from When Imarried mV husband、 hiS preViQuS arriage。 Tbecame their Stepmothers and Watched them becornc Young teenagers。 Although they jived primarily W arncd tO adjust。 We enjoyed Vacations toOgether、 ith their mother、they spent a lot of dme Nuith us as well、Over he years、We al ]ea ae family meals、WorKcd on homework、 played bi hat li sider。 Since I had no children of my Own、 my limited Q my husband's four、 and often I felt sad because eball、 rented videos。 FIOWeVer。 志 condinued tQ fe eNperience Qf parenting W T OUuId never knQW the special bOnd that exiSts betvecn DaTCnt and a child. Hen the Children moved tO a Own that was a fiVe-hour drive aWayx my husband as understandably upset We promptly set up an e-mail and chatline serVice。 っ) LDS This technology、 combined with the telephone, would enable us to reach the children on a daily baSiS by sending frequent notes and ImesSageS。 and even chatting together When we were all on-line.

有効数字についてです 下線部の箇所19.6m→20mにするのがなぜかわかりません🤔

(2)で、xの式って x=Asinωt だと思うのですが、なぜcosなんですか？

数学Aの整数の性質のところです。 解ける人教えてください！

ヒントに、正三角形AnBnCnの辺の長さを求めると書いてあるのですが、そこから分かりません。どのようにして導いていけばよいでしょうか…？

これのtの求め方を教えてください！答えは2です

問2.3が全部わからないです…。 解説付きで教えてほしいです…。出来るだけ丁寧だと助かります。または、教科書などの参照するといい部分を教えていただきたいです。