23. f(x) is vertically shrank by a factor of 1/3. How will you represent f(x) after transformation? A. f(3x)
B. 3f(x)
C. 13f(x)
D. f(13x)

Step-by-step explanation:

vertical stretching / shrinking has the following transformation.

f(x) -> a * f(x)

when a >  1, it is stretching

when 0< a < 1, it is shrinking.

when  -1 < a < 0, it is shringking + reflection about the x-axis

when a < -1, it is stretching + reflection about the x axis.

Here it is simple shrinking, so 0 < a < 1.

I expect the answer choice to show (1/3) f(x).

However, if the question plays with the words

"shrink by a factor of 1/3" to actually mean a "stretching by a factor of three", then B is the answer (stretch by a factor of three).

f(x) = y

f(-3) = -5

step-by-step explanation: