which of the following transformations include a horizontal stretch?

y= -f(2(x-1))+13

y= 3f(2x+4)-7

y= 2f(x-3)+1

y= 0.5f(1/3x)-2

for 0.5f its 1/2f just to clear up the x is on the fraction not the 3 in 1/3x too thanks!