Can someone please lmk the answer bc I have no clue how to do this

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]