8t-5r-t-3r i'm so confused on equations

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52

What is the mean of the data set 125, 141, 213, 155, 281

Abcd is reflected across the x- axis, then rotated 90 clockwise about the orgin, and finally reflected across the line y= x to form a’ b’ c’ .