HELP! DUE TOMMOROW AND I DONT UNDERSTAND

Which are results of technological advances? increased people's exposure to new ideas created a global culture valued by people around the world brought harmony to diverse groups of people reduced the number of people living in rural areas

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Who believed that the universe was made of tiny uncuttable particles