Help me with my last question for 30 to 100 points if correct

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

What percent of the circle below is shaded?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.