Which modern-day nation did the inca empire fail to conquer any part of?

Brazil.

Explanation:

The Inca Empire, which name means Four Regions in Quechua, was the greatest empire in pre-Columbian America. It used conquering and nonviolent assimilation, to incorporate Peru, western and south central Bolivia, southwest Ecuador, a big part of Chile, northwest Argentina, and a small portion of southwest Colombia.  

ghana achieved independence peacefully, while algeria gained independence through an armed struggle.

the correct answer is:   "   3.6 % " .

          →   the unemployment rate is:   " 3.6 % " .

explanation:

to calculate the "unemployment rate" :

the "unemployment rate"   =

  [# of people unemployed] /   [working age population]   * 100 %   ;

                =   [9 million] / [250 million]     *   100 % ;

    →     note:   the units of "million" cancel out;

                    since:   " {million} / {million} = 1 " ;

                =   (9 / 250)   * 100 %   ;

                = 0.036 * 100 % ;

                =   3.6 %

answer:   the unemployment rate is:   " 3.6 % " .