What is the scale factor? what is the scale factor?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

What would the rule be for the reflection of y=-3