Can someone pls me with 15 and 18 ?

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table

If you apply the changes below to the linear parent function f(x)=x what is the equation of the new function vertically stretched by a factor of 3 flip over the x axis