NEED GEOMETRY HELP 13 POINTS

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab