You plug 3 into B so 2(3) + 9 = 15
Thank you for posting your question here. I hope the answer below will help.
Vo=110 feet per second
h0=2 feet
So, h(t) = -16t^2 +110t +2
Take the derivative: h'(t) = 110 -32t
The maximum height will be at the inflection when the derivative crosses the x-axis aka when h'(t)=0.
So, set h'(t)=0 and solve for t:
0 = 110 -32t
-110 = -32t
t=3.4375
t=3.44 seconds
Vertex<span> of a parabola is the point where the parabola crosses its axis of symmetry.</span>
