Please help. i don't understand what it's asking me to do

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

What rotation was applied to triangle def to create d’e’f’?