-8z+12=-12

plz help asap
what is the answer
and what does z stand for??!?

The table below represents a linear function f(x) and the equation represents a function g(x): x f(x) −1 −5 0 −1 1 3 g(x) g(x) = 2x − 7 part a: write a sentence to compare the slope of the two functions and show the steps you used to determine the slope of f(x) and g(x). (6 points) part b: which function has a greater y-intercept? justify your answer. (4 points)

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with

If the value of cos330°is√3/2 then find cos 165°.