1. The problem states that the weight of the cat is 4.6 kg to 2 significant figures and asks for the upper bound. 2. When a number is given to 2 significant figures, the upper bound is found by adding half of the place value of the last significant digit. 3. Here, 4.6 has 2 significant figures, and the last digit is in the tenths place (0.1). 4. Half of 0.1 is 0.05. 5. Therefore, the upper bound is calculated as: $$4.6 + 0.05 = 4.65$$ 6. So, the upper bound of the cat's weight is 4.65 kg.