Someone please help me with this question

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

Does the point (1, sqrt 7) lie on circle shown.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'