(x-8)^2+y^2=225 I'm not able to factor it
I think it will be d because you either add or times
A. isn't correct because functions are by their definition different.
B is true. Domain of both is x>0 and range is 1/2 as large. because of 1/2 factor in first function
C is true . because of -2 it is shifted to the right by 2 and it is shrunk vertically by 1/2
D isn't true because ranges are not the same.