Final answer:
The total mass of material in the recycling bin, including glass and plastic, is 4.5 kg.
Step-by-step explanation:
The total mass of material in the recycling bin can be found by adding the masses of the glass and plastic. We need to convert the mass of plastic to kilograms by dividing it by 1000 since 1 kilogram is equal to 1000 grams.
Mass of glass = 4 kg
Mass of plastic = 500 g รท 1000 = 0.5 kg
Total mass of material = Mass of glass + Mass of plastic = 4 kg + 0.5 kg = 4.5 kg