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Mathematics, 26.07.2019 20:10 lacourboud20005

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the area (a) of a circle is a function of its radius (r) and is given by the function a = f(r) = πr2. what is the domain of this function?
a.
all positive real numbers
b.
all real numbers
c.
all positive real numbers including 0
d.
all real numbers excluding fraction

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