Please help me, this is for my math test.

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

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

Divide. write in the simplest form. 4 1/6 divided by 10