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How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

Explain why the function is discontinuous at the given number a. (select all that apply.) f(x) = 1 x + 1 a = −1 f(−1) is undefined. lim x→−1+ f(x) and lim x→−1− f(x) exist, but are not equal. lim x→−1 f(x) does not exist. f(−1) and lim x→−1 f(x) exist, but are not equal. none of the above

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?