1/2x+3=5
how do you do 2 step problems like this

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

Quadrilateral abcd in the figure below represents a scaled-down model of a walkway around a historic site. quadrilateral efgh represents the actual walkway. abcd is similar to efgh. what is the total length, in feet of the actual walkway?

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?