Please help :[ write an equation that represents the transformations formed by the following items:

a) horizontally shifting the graph 4 units to the left of f(x)=√x and then vertically compression by a factor of 1/3

b) vertically stretching the graph by a factor of 4 of f(x)=√x and then vertically shifting the graph 3 units up

c) horizontally stretching the graph of f(x)=√x by a factor of 2 and then vertically shifting the graph 6 units down