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Giúp mình vs .-. Lm nhanh, chính xác sẽ có ctrlhn nhó

Làm giúp em với ạ trưa phải nạp rồi

(x+1)+(x+2)+(x+3)+.....+(x+98)+(x+99)=5049

m.n ơi giả hộ em bài này trong sáng nay nhé đg cần gấp lắm ạ

phaan tihcs thanhf dda nhan tu chung

Giải giúp. Mình với @@ Câu tlhn +5sao + tym ạ

III. Choose the item A, B, C or D that best answers the question about the passage. A UFO (Unidentified Flying Object) is any object flying in the sky which cannot be identified by the person who sees it. Sometimes the object is investigated. If people cannot figure out what the object is after an investigation, it is called a UFO. If they figure out what the object is, it can no longer be called a UFO because it has been identified. Even though UFOs can be anything, people can use the world UFO when they are talking about alien spacecraft. Flying saucer is another word that is often used to describe an identified flying object. Studies estimate that 50-90% of all reported sightings are identified later. Usually 10-20% are never identified. Studies also show that very few UFO sightings are hoaxes (people trying to trick other people). Most UFOs are actually natural or man-made objects that looked strange. 80-90% of UFOs are identified as one of three different things: (a) astronomical causes (for example: planets, stars, or meteors); (b) aircraft; and (c) balloons. 10-20% of UFOs are other causes, such as birds, clouds, mirages, searchlights, etc. 1. Another word used to describe a UFO is . A. flying saucer B. cooking plane C. spacecraft D. astronaut 2. How many percent of all reported sights are not identified? A. 20-30% B. 10-20% C. 30-50% D. 80-90% 3. Most of UFOs are identified as one of the following things except . A. balloons B. clouds C. stars D. rains 4. Which of the following sentences is NOT true? A. UFO means Unidentified Flying Object. B. Many UFO sightings are hoaxes. C. UFO is often used to talk about alien objects. D. Over half of all reported UFO sightings are identified. 5. What does the word “figure out” in paragraph 1 mean? A. calculate B. observe C. explain D. require

một mảnh vườn hình chữ nhật có chiều rộng 20m biết 2 lần chiều dài bằng 4 lần chiều rộng .Xung quanh mảnh vườn đó ngừi ta trồng cam ,cứ cách 4m trồng 1 cây .hỏi xung quanh mảnh vườn đó người ta trồng được bao nhiêu cây cam ?

Giải thích cho em dòng thứ 4. Đề bài là y=sinx + √2-sin^2x. Tìm GTLN, GTNN