A pond contains two distinct species of fish, which we will call the red and blue fish. There are r red fish and b blue fish. Suppose the fish are removed from the pond in random order. (That is, each selection is equally likely to be any of the remaining fish.) What is the probability that the red fish are the first species to become extinct in the pond?

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

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.