PLEASE HELP ME IM FAILING 50 POINTS

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

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

In the geometric progression –3, 12, −48… what term is 3,072?