Where do the lines y= x + 7 and y = 5x - 13 intersect?

What numbers are included in the set of integers? what numbers are not included?

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

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.