A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 2950, exactly as in the question.
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1000 metres = 1 kilometre so 2950 m = 2950/1000 = 2.95 km. Simple!
Expressed as a percentage, 531/2950 x 100 = 18 percent.
If - like here - you are asked for a "difference", that usually means you have to subtract. The difference is 2950-2550 = 400 meters
No, the sum of a repeating decimal and a terminating decimal is never a terminating decimal.
A terminating decimal is a decimal that ends. A repeating decimal is a decimal that goes on and on.