Determine the vertex of the following quadratic function f(x)=3(x-2)^2+7

Icould really use some with this question.

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?

This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer