I keep mixing up "I have finished my homework" and "I finished my homework". My teacher says both are correct but in different situations. What is the actual rule?
أنا فاهمة إن الكتلة بالكيلوجرام والوزن بالنيوتن، لكن مش مستوعبة ليه جسم كتلته 60 كجم يفضل 60 كجم على القمر وفي نفس الوقت وزنه يبقى السدس. ممكن حد يشرح الفكرة بمثال رقمي؟
عندي المعادلة x² + 2x + 5 = 0 ولما حسبت المميز طلع b² - 4ac = 4 - 20 = -16، يعني بالسالب. الكتاب بيقول مفيش حل حقيقي، لكن المدرس قال إن فيه حل في الأعداد المركبة. إزاي أكمل الحل وأكتب الجذرين بالشكل a + bi؟
In class we learned that solids are denser than liquids, so they sink. But ice is the solid form of water and it floats. Our teacher said it is about the structure of the molecules but I did not understand the part about the hexagonal shape. Can someone explain it simply?
In class we learned that solids are denser than liquids, so they sink. But ice is the solid form of water and it floats. Our teacher said it is about the structure of the molecules but I did not understand the part about the hexagonal shape. Can someone explain it simply?