The water level of a lake has been increasing each year. the initial water level of the lake was 800 meters, and the water level increases by 1 m each year. use this information to answer the questions below.

since the water level increases by 1 m each year, the increase in water level is the same as the number of years. write an equation relating final water level (w) to the time in years (t).

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.