Why is, 9a is equivalent to 11a - 2a true ?

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

List the sides of δrst in in ascending order (shortest to longest) if: a ∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12°

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !