What is dimension of work done?​

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)

What is the measure of angle x? a.101 b.158 c.44 d.79