Cho hai hàm f : R −→ R, g : R −→ R lần lượt xác định bởi f(x) = ax + b và g(x) = cx + d, hãy xác định a, b, c, d để f ◦ g = g ◦ f và
f(f(x)) = f(x) + 1, ∀x.

The table below lists recommended amounts of food to order for 10 party guests. how much of each food item should nathan and amanda order for a graduation party with 55 guests? use the table to answer. item amount fried chicken 16 pieces lasagna 7 pounds deli meats 1.8 pounds sliced cheese 1 and two fifths pounds bakery buns 1 dozen potato salad 2 pounds