Decrease = New number - Original Number
% Decrease =

× 100
Decrease = 9 - 12 = -3
% Decrease =

= -0.25 × 100 = -25
Your answer =
-25
My answer would be 65° because none of the other choices make sense!
This angle is clearly under 90°, which eliminates the choices of 92° and 138°. This angle is also clearly bigger than 27°, which eliminates this choice too!
I really hope this helped, if there’s anything just let me know! ☻