Answer:
(x) = 
Step-by-step explanation:
let d(x) = y and rearrange making x the subject, that is
2x - 4 = y ( add 4 to both sides )
2x = y + 4 ( divide both sides by 2 )
x = 
Change y back into terms of x, so
(x ) = 
B.90 because 90 degrees is above the original angel
The answer would be the first choice 4+b
A(b + c) = a*(b + c) = a*b + a*c
You must multiply individual terms and see what it would equal