Find the height, in feet, of the rock after 5 seconds in the air.
A rock is launched from a cannon. It’s height, h(x), can be represented by a quadratic function in terms of time, x, in seconds.
After 1 second, the rock is 129 feet in the air; after 2 seconds, it is 236 feet in the air.

- anonymous

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- anonymous

@JoKeR0331

- anonymous

someone please help

- anonymous

pleaseeeee

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## More answers

- anonymous

@unknownunknown

- unknownunknown

Do we have the angle of the cannon, is it firing directly upward?

- anonymous

it dosent say @unknownunknown

- unknownunknown

Can you do a screenshot of the question?

- anonymous

i cant its a test

- anonymous

do you want me to put every detail? @unknownunknown

- unknownunknown

We will need every detail.. that's insufficient information as it is.

- anonymous

Help please A rock is launched from a cannon. It's height, h(x), can be represented by a quadratic function in terms of time, x, in seconds.After one second, the rock is 129 feet in the air; after 2 seconds, it is 236 feet in the air. Find the height, in feet, of the rock after 5 seconds in the air.

- anonymous

@unknownunknown all of it

- unknownunknown

Alright well, I'm going to assume a lot, so I can't see if this will be definitely correct, but the question contains incorrect information to answer properly. So we'll just have to proceed with what we have..
Let me confirm the equation to make sure, one sec.

- unknownunknown

insufficient information*

- anonymous

so you cant solve it at all? @unknownunknown

- anonymous

@unknownunknown ?????

- unknownunknown

Is there a multiple choice or you must write the answer?

- anonymous

must write the answer @unknownunknown

- unknownunknown

So, if we let y equal the displacement, y = 9.8*t^2/2 + initial velocity * time
So first of all, we'll need to solve for the initial velocity, can you rearrange the equation to solve for v?
y=9.8*t^2/2 + v * t

- unknownunknown

Actually since it's coming down, we should make 9.8*t^2/2 negative.
So y = -9.8*t^2/2 + v*t

- anonymous

i think its a large number for feet @unknownunknown

- unknownunknown

I'd say the answer is approximately 527, somewhere around there.

- anonymous

its not @unknownunknown

- unknownunknown

And how do you know that?

- anonymous

i just tried

- anonymous

@unknownunknown

- unknownunknown

Ok wait, let me work it out

- unknownunknown

Have you covered gravity in class? g = 9.8?

- anonymous

no @unknownunknown

- unknownunknown

Okay so. Let's say we have a function.. f(t) = -11*t^2 + 140*t
If we plug into this equation t=1, we have -11 + 140 = 129 which satisfies the first part
Then if we plug t=2, we have -11*4 + 140*2 = 236 which satisfies the second part

- unknownunknown

So then for f(5) = -11*25 + 140*5 = 425

- anonymous

right @unknownunknown

- unknownunknown

Okay, good.

- anonymous

can you help with another one @unknownunknown

- anonymous

Widget wonders produces widgets. They have found that the cost, c(x), of making x widgets is a quadratic function in terms of x.
The company also discovered that it costs $23 to produce 2 widgets, $103 to produce 4 widgets, and $631 to produce 6 widgets.

- anonymous

@unknownunknown

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