How would i write a function rule f(x) = _x+_ if i have an x and y chart?

What is the value of 1/3x + 7x when x = 5

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

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much