Pls help asap will give brainiest

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

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?