00:01
All right, this one says the baseball is thrown into the air with an upward velocity of 30 feet per second.
00:04
It's height, h and feet after t seconds is given by the function negative 16 t squared plus 30t plus six.
00:11
What's the ball's initial height? so that comes from your equation plus 30t plus six.
00:21
So your initial height is, so part a is six feet.
00:28
It's the last number.
00:30
So b, how long will it take? how do you know? so it's always, like your general formula is always, that's your initial height.
00:40
So that's how you know.
00:41
Part b, how long will it take the ball to reach its maximum height? so you just need to find the vertex, the x coordinate of your vertex.
00:54
So that's negative b over 2a.
00:56
So that equals negative 30 over 2 times negative 16...