If someone can explain this it would really help.​

What is the length of the unknown leg in the right triangle ?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

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.