Help on number 12 pls

Polynomial that can be factored as (3x-4)(3x+4)

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

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