Name: Interpreting features of a quadratic model
Uploaded: 2020-03-27T17:19:15.000Z
Duration: 2 min 37 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

- [Instructor] Katie throws a ball in the air

To-infinitive

The function f models the height of the ball, in meters,

as a function of time, in seconds, after Katie threw it.

the height looks like it's a couple of meters.

to a little under 2 1/2 seconds, the ball's going up.

And then after a little under 2 1/2 seconds,

to five seconds or close to five seconds,

So pause this video, and see if you can work it out.

All right, now let's look through the choices.

So the first one says Katie threw the ball

So if she threw it from a height of five meters,

we would've been at a height of five meters.

So I'm assuming that Katie is not five meters tall.

She just threw it from her regular height.

And so we can rule out this first choice.

The second one says at its highest point,

the ball was about 31 meters above the ground.

The ball was in the air for about 2 1/2 seconds.

So we can clearly see that that is not the case.

for about 2 1/2 seconds, but then it was going down

And so it was actually in the air for almost five seconds.

The ball reached its highest point in the air

about 2 1/2 seconds after Katie threw it.

2 1/2 seconds after Katie threw the ball,

It looks like it reached its highest point

But they said about, so they're speaking in rough terms.

I wouldn't have selected it 'cause it seems like it happened

at like 2.45 seconds or something like that.

But there you go, those are the ones that seem true.

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Interpreting features of a quadratic model

assume

roughly

bit

statement