HURRY Given z1 = 2 +sqrt3 i, and z2 = 1 -sqrt3 i, what is the sum of z1 and z2

1
3
3 + 2StartRoot 3 EndRoot i
–1 – 2StartRoot 3 EndRoot i

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.