Taxi cab passengers are charged $2,.50 upon entering a cab. they are then charged $1.00 for every mile traveled. is it proportional?

Find the missing dimension extra points

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.

Find the percent error of the measurement 4 cm