Manuel has 13 new magazines to read. Let M be the number of magazines he would have left to read after reading R of them.

Write an equation relating M to R. Then graph your equation using the axes 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.