Which quadratic function in vertex form can be represented by the graph that has a vertex at (4,-5) and passes through the point (7, 1)?

How do i work this problem out using the equation a=pe^rt

Which number completes the inequality? 2/3 < _ < 7/9

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.