Beatrice graphed the relationship between the time (in seconds) since she sent a print job to the printer and the number of pages printed

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 is the difference between the predicted value and the actual value

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?