In the same diagram of the staircase railing, what is the value of n? (picture included)

Solve for x by completing the square. 2x^2-4x+7=0

How do i do this activity, is appreciated

Which is a logical conclusion based on the given information? a. figure abcd is a rhombus by the definition of a rhombus. b. segment ac is congruent to segment dc by cpctc. c. angle acb is congruent to angle adc by the angle-side-angle theorem. d. triangle acd is congruent to triangle cab by the hypotenuse-leg theorem.