Question: Ryan is trying to hit a golf ball over a tree that is 18m above the ground. The height of the ball is modelled by the function h(t)= -5t2 + 20t, where t is the time in seconds. Explain the domain and range of the function. Will the ball go over the tree? This is grade 11 review and I totally forgot how to do this. (I think finding the max/min). I need some help getting started in the right direction or even finding the answer of the domain (with steps please), and I will try to figure out the range my self. I already know the answer's I need to know how to get them. D: (XER | 0 < X <4) R: (YER | 0 < Y <20) Meaning the ball will pass over the tree. But how did they get that!!! Please help.