State the transformations:

My answer:

Vertical Expansion by OR Horizontal Compression by .

Text Answer:

Vertical Expansion by OR Horizontal Compression by .

Just wondering, how is the compression factor ? Is it because , therefore Horizontal Compression by ?

Also, is a Horizontal Compression by the same thing as a Horizontal Expansion by ? The terms "Expansion" and "Compression" become quite confusing when used with whole numbers and fractions. It's hard to remember which one refers to which.