Which set of ordered pairs represents a function? {(7,4), (3,8), (-4, –4), (0,4)}
{(-8,0), (-5,6), (-8,1), (-6,5)}
{(-5,1), (3, – 7), (2, -4), (2,7)}
{(4,2), (4, -9), (+9, -6), (7,1)}

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

Anyone know? is appreciated! will mark brainliest if correct!

Afamily of five rents a kayak and splits the total time, k, equally. each family member spent less than 25 minutes kayaking. which values can be used to complete the math sentence below so that it accurately represents the situation? intro done