What are the steps to solve an equation with a variable?

49xy +34y - 72z. determine the degree of the polynomial

Could someone with number 1 and 2

The graph of the the function f(x) is given below. find [tex]\lim_{x \to 0\zero} f(x)[/tex] [tex]\lim_{x \to 1+\oneplus} f(x)[/tex] [tex]\lim_{x \to 0-\zeroneg} f(x)[/tex]