What does "reciprocal impact" mean?

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Ten times the square of a non-zero number is eqaul to ninety times the number

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.