Answer:
C
Step-by-step explanation:
"per cent" means out of hundred, so it's 70 out of hundred.
2x-4=9
2x=y
2x=13
Use the cosine ratio, adjacent over hypotenuse. Plug in the values
cos70=x/25.5
Isolate x. Multiply both sides by 25.5
x=25.5*cos70
Enter the equation into a calculator
Hope this helps :) If you have a doubt just comment :)
