Question

Please help....

Answer 1

A model rocket is launched from a roof into a large field. The path of the rocket can be modeled by the equation y = 0.04x+ 8.3x + 4.3, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. How far horizontally from its starting point will the rocket land?

Answer 2

208.02 m
416.03 m
0.52 m
208.19 m

Answer 3

the answer is D right

Answer 4

is that supposed to be "0.04x^2"?

Answer 5

@apoorvk yes...

Answer 6

what did you do here? equated 'y' to 0?

Answer 7

hold on...

Answer 8

. . . -8.3 +- √((8.3^2) - (4)(0.04)(4.3))
x = ----------------------------------------…
. . . . . . . . . (2)(0.04)

. . . -8.3 +- √68.202
x = ------------------------
. . . . . . . . . 0.08

This results in the following two possible answers.

. . . -8.3 + √68.202
x = ---------------------- = -0.52
. . . . . . 0.08

. . . -8.3 - √68.202
x = ---------------------- = -207.36
. . . . . . 0.08

Answer 9

but i wasnt sure of the final result

Answer 10

i THINK its D

Answer 11

well, good work, but how can this -8.3 + sqrt68.... be so large? ever thought about this?
sqrt64 is 8, so sqrt68... would be a bit more than 8.

Answer 12

@apoorvk wait so D is the correct answer right?

Answer 13

never mind......

Answer 14

Wait a sec, there seems to be a calculation error.

Answer 15

o...

Answer 16

what was the error @apoorvk

Answer 17

...

Answer 18

ok

Answer 19

sqrt(68.202) = 8.25 something.

so, -8.3+8.25.. = something

so x = that something^ divided by 0.08 which is again negative.
I seem to getting a negative value for 'x'. I wonder if that makes any sense... How can distance be negative?

Answer 20

o...so i did it wrong

Answer 21

No, the calculations that you've shown are correct. But the final thingy seems wrong to me.

anyways, even if we consider negative answers,
then i seem to be getting 206.95... but options A and D are so proximate then...

Answer 22

thats what i came down to...now i just dont now if its a or d

Answer 23

sorry i have u stuck on this question

Answer 24

Lol, no need to say that.

I guess just move on to next problem for now, and clarify this with your teacher later.

Answer 25

yea