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Answer:
d = 0.277 km
Step-by-step explanation:
Distance covered in January = 0.5² km
The distance covered in February = 0.3³ km
We need to find the total distance he swam for both months. It can be calculated by finding their sum. So,
[tex]d=0.5^2+0.3^3\\\\d=0.25+0.027\\\\d=0.277\ km[/tex]
So, he swam 0.277 km for both months. Hence, the correct option is (b).