Question

Please please someone help!! :(
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.

Answer 1

Do you know the formulas

Answer 2

No I don't

Answer 3

Ok

Answer 4

I have a similar problem to this so we can just change the numbers

Answer 5

Okay

Answer 6

A rock is launched from a cannon its height, h(x), can be represented by a quadratic function in terms of time, x, in seconds.
After 1 second, the rock is 186 feet in the air; after 2 seconds, it is 344 in the air.
Find the height, in feet,of the rock after 8 seconds in the air.;
:
Using the form: ax^2 + bx + c = y
y = h(x), c = 0
:
x=1; y=186
a(1^2) + 1b = 186
a + b = 186
:
x=2; y=344
a(2^2) + 2b = 344
4a + 2b = 344
:
Multiply the 1st equation by 2, subtract from the 2nd equation
4a + 2b = 344


2a + 2b = 372
--------------Subtraction eliminates b, find a
2a = -28
a = -14
:
Find b using: a + b = 186
-14 + b = 186
b = 186 + 14
b = 200
:
The equation: h(x) = -14x^2 + 200x
:
"Find the height, in feet,of the rock after 8 seconds in the air.;
x=8
h(8) = -14(8^2) + 200(8)
h(8) = -14(64) + 1600
h(8) = -896 + 1600
h(8) = 704 ft after 8 sec

Answer 7

Do you need help or just answer?

Answer 8

I would prefer the answer, but help is ok. I tried to plug in all the numbers with what you gave me... but I just confuse myself.
I really need to get this one right

Answer 9

So if you could give me the answer, I'd be very thankful... and it'd be much appreciated!

Answer 10

Ok sure let me figure it out do you have time?

Answer 11

Yes, take your time. Thank you so much!!

Answer 12

Your welcome!

Answer 13

315ft at 5 seconds

Answer 14

is the answer

Answer 15

Was it right?

Answer 16

No I got it wrong, I just now have to get the last one right. It's no problem. Do you have time to maybe help me with one last one?

Answer 17

Sure

Answer 18

Quick Computing Company produces calculators. They have found that the cost, c(x), of making x calculators is a quadratic function in terms of x.

The company also discovered that it costs $45 to produce 2 calculators, $143 to produce 4 calculators, and $869 to produce 10 calculators.

Find the total cost of producing 1 calculator.

Answer 19

Is there any options?

Answer 20

or are you typing?

Answer 21

No options