The feet of a commemorative parabolic steel arch 100m high are 200m apart. determine whether the focus of the arch is above or below ground and indicate the number of feet it lies above or below ground. 75 ft above 25 ft above 25 ft below 75 ft below

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.