Jeremy có những chiếc ô tô đồ chơi cùng kích cỡ trong hộp của cậu ấy, trong đó có 5 chiếc màu đỏ, 9 chiếc màu xanh và 4 chiếc màu trắng. Anh ta cần chọn bao nhiêu chiếc ô tô từ hộp mà không cần nhìn để chắc chắn rằng mình sẽ lấy được 3 chiếc ô tô đồ chơi cùng màu?
giúp mình với 

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Trong mặt phẳng tọa độ Oxy, cho parabol (P): y = x2 và đường thẳng d: y = mx + m + 1 (với m là tham số). a) Tìm m để đường thẳng d luôn cắt parabol (P) tại hai điểm phân biệt. b) Gọi x1, x2 lần lượt là hoành độ giao điểm của đường thẳng d và parabol (P). Tìm giá trị của m để x1, x2 thỏa mãn x12(x2 + 1) + x22(x1 + 1) = 5.

địa điểm A và địa điểm B cách nhau 35km.Tại cùng một thời điểm, một ô tô xuất phát từ A đi đến B và một xe máy xuất phát từ B đi đến A. Sau 30 phút thì 2 xe gặp nhau. Nếu cả 2 xe đi cùng một lúc và đi cùng chiều ( ô tô đi từ A đến B, xe máy đi từ B) thì sau 1,75 giờ ô tô đuổi kịp xe máy. Tính vận tốc của ô tô và vận tốc của xe máy.

Các bạn giúp mình với nhé! Giải chi tiết giùm mình luôn nha!!!