please help!!
in the function f(x), x is replaced with 3x
f(x)=1/2sin(x)-4
what effect does this have on the graph of the function?
a. the graph is vertically compressed by a factor of 1/3
b. the graph is horizontally compressed by a factor of 1/3
c. the graph is vertically stretched by a factor of 1/3
d. the graph is horizontally stretched by a factor of 1/3
