Fractions equivalent to -2/-3

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Ihave trouble finding the nth term of a linear sequence

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?