Srry for so many questions but halp

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

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

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?