Mathematics ninth grade (1) 2.4 quadratic function application (2) answer! Urgent! Thank you!

Mathematics ninth grade (1) 2.4 quadratic function application (2) answer! Urgent! Thank you!

The answer to the eighth question is 80 yuan.. 1. The ejected water is parabolic. Suppose the parabolic equation y = ax ^ 2 BX C B coordinate (0,1.5) C coordinate is (2,3.5) because C is the highest point - B/