Asked by Sue

The velocity of a ball thrown in the air is 72ft
Per second. The height of the ball after t seconds
Is represented by the equation
H = 72ft t - 62t^2.

Describe the dependent variable, the domain and range.

Honestly I have to say I am lost

72 + 72ft - 256 = ?
72 + 184t =0
Answered by Reiny
clearly this ball was thrown on this earth, or else your equation would have been
h = 72t - 16t^2

I will assume you have a typo

Your equation is a parabol.
Do you know how to find the vertex of a parabola?

I too am lost in trying to figure out your arithmetic.
Did you decide to just add and subtract some numbers?
Answered by Sue
This is exactly the word problem that was given to me by my teacher whom is a coach if I might add.
Answered by Reiny
I just noticed in the "Related Questions" below, that Steve noticed the same problem with the same question.
I would strongly suggest that your coach (math-teacher) is mistaken.
Answered by Michaela
H=72t-16t2