They are 300 and 30
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A rational number is one which can be expressed as a ratio of two integers.
Line graph is used to show relationship between two variables.
The relationship between addition and subtraction is inverse. We can add two counting numbers together, and we do not need to pay attention to the order of these whole numbers. But, for subtraction, we have to subtract the smallest counting number from the largest counting number.
Two
A 'ratio' shows a relationship between two numbers. There's no such thing as the ratio of one single number.