The domain of a function are the possible input values of the function.
<em>The domain of the function is (d) Whole numbers</em>
First, we identify the start and end values of x on the graph.
We have:

The graph has no end; so:

This means that the domain of the graph is 
The number of times one can visit the pool cannot be decimal.
Hence, the domain of the function is whole numbers
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Answer:
What are the options?
Step-by-step explanation:
If you mean half as in 1/2, then yes, 0.31 is less than half because 1/2 as a decimal is 0.50.
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Diameter is 13
radius is 6.5
circumference is 13pi or 40.84
area is 42.25pi or 132.732