Please help me with question 3 guys

Abouncy ball is dropped such that the height of its first bounce is 5.5 feet and each successive bounce is 64% of the previous bounce's height. what would be the height of the 7th bounce of the ball? round to the nearest tenth (if necessary).

What rotation was applied to triangle def to create d’e’f’?

What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5