The distance from Point A to Point B is 5x 2 + 3 miles. The distance from Point B to Point C is 10 - 2x 2 miles. The distance from Point C to Point D is 4 miles. If Mike walks from Point A to Point B, then to Point C, and finally to Point D, which expression represents the total distance he travels in miles?

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.