What was the main cause of the islamic world's hardships during the thirteenth century? a. western europeans invading muslim lands b. mongol tribes invading muslim lands c. dissension between rival factions of islam d. famine and diseases introduced from africa

I think the answer is B

Explanation: Hope it helps :D

                      Hope u get a good grade :D

eroupe is a great mideval place and alot of wars went on alao

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 % " .