1. Thế nào là mẫu thống kê? Trình bày các cách thu gọn mẫu. Lấy ví dụ minh họa và thu gọn mẫu đó theo các cách khác nhau. các b giúp mình câu này với ạ, mình còn vướng phần vế sau ạ

Viết các câu sau với mệnh đề if (1,2,3) 1.It was raining. That's the only reason I didn't take the children to the beach. =>If.... 2. When I bought this house I didn't realize that in summer planes skimmed the roof every five minutes.(If I (knew)...I(not buy)etc.) =>If....

The children have gone ....... A. for shopping B. to shop C. shopping D. to shopping

Câu 1: Trong các phản ứng sau, những phản ứng nào đúng (có xảy ra): a. 2NaHSO4 + BaCl2 → Ba(HSO4)2 + 2NaCl b. 2NaHSO4 + BaCl2 → BaSO4 + Na2SO4 + 2HCl c. NaHSO4 + BaCl2 → BaSO4 + NaCl + HCl d. 4NaHSO4 + BaCl2 → Ba(HSO4)2 + 2Na2SO4 + 2HCl Câu 2: Trong các phản ứng sau, những phản ứng nào đúng (có xảy ra): a. Mg(HSO4)2 + 2NaOH → Mg(OH)2 + 2NaHSO4 b. Mg(HSO4)2 + NaOH → NaHSO4 + MgSO4 + H2O c. Mg(HSO4)2 + 2NaOH → Na2SO4 + MgSO4 + 2H2O d. Mg(HSO4)2 + 4NaOH → 2Na2SO4 + Mg(OH)2 + 2H2O

XXI. Choose the correct answer A, B, C, or D to finish the sentences. 1. We _______________ go to the party. We’re going to a wedding. A. Couldn’t B. won’t be able to C. Will can’t D. want be able to 2. A: Can you lend me some money? B: Sorry. I ___________ . I haven’t got any either. A. Couldn’t B. am not able to C. Can’t D. won’t be able to 3. They________ go. The weather was too bad. A. Weren’t able to B. cant C. Won’t be able to D. couldn’t 4. She________ come on holiday next month if her parents give her permission. A. Can’t B. will be able to C. Could D. couldn’t 5. The fishing boat sank but luckily all the crew ________ save themselves. A. Couldn’t B. will be able to C. Were able to D. can 6. Listen! We ____________ hear a train in the distance. A. Can B. could C. Will be able D. were able to 7. I don’t think he ___________ win the next competition. A. Could B. Can’t C. Won’t be able to D. Will be able to 8. Michael is very proud to __________ play in a jazz-band. A. Be able to B. Can be able C. Will be able to D. Could be able 9. When I was five, I _________ swim. A. Can not B. Could not C. Am not able to D. Will not be able to 10. I have to go to a meeting tomorrow night so I _________ come to the party. I’m very sorry. A. Can’t B. Wasn’t able to C. Couldn’t D. can’t be able to

Vẽ nữ sinh mặc áo dài nhe, vẽ tranh chì, có đánh phối đàng hoàng, cấm vẽ kiểu học sinh tiểu học nha , cấm màu mè ... T^T ----> Dáng đẹp đẹp xíu, đừng lép nha ;-;

phương trình phản ứng của C6H12O6 + CH3COOH là gì vậy mn

giải giúp vs ạ các kao nhân cute hột me, iem đang gấp lắm

Mới học đến ĐỐI XỨNG TÂM nên ko dùng kiến thức chưa học

XX. Use the words given and other words, complete the second sentence so that it has a similar meaning to the first sentence. Do not change the word given. (Use 2-5 words in total). 1. I think he can speak Japanese very well. able I think he ……………………………………………….very well. 2. Mr. Minh has to wear his glasses to read the newspaper. cannot Mr. Minh …………………………………… without wearing his glasses. 3. Peter regrets not being able to play tennis well. could Peter really wishes ………………………………………. well. 4. Despite being unable to swim himself, John is very keen that his children should learn. can’t Although he ……………….. ……………….., John is very keen that his children should learn. 5. Maria couldn’t sing or dance. unable Besides………….. …………….. , Maria couldn’t dance either.