Question

PLEASE HELP D:

Answer 1

how do I write this equation: V= (12)(8)(2) = 192 inches^3 in terms of x?

Answer 2

Please walk me through step by step don't just give me the answer....

Answer 3

How can you write it in terms of x if it does not contain an x?

Answer 4

I'm not sure :/

Answer 5

The directions phrase it like this exactly.... "The equation for the volume of the object written in terms of x...."

Answer 6

Could you post the entire question?

Answer 7

is there an image with this problem?

Answer 8

no there isn't a image

Answer 9

That was the entire question. This is part of a project I'm doing for Algebra two and I have to solve my partners demsions

Answer 10

So I take it this was a lab?

Answer 11

Yes

Answer 12

Could you post the directions?

Answer 13

Directions:
A description of the rectangular box chosen
My partner chose a rectangular box.
The length, width, height and volume of the object
The dimensions of my partner’s rectangular object is length 12 inches, width 8 inches and height 2 inches with a volume of 192 inches^3.
The equation for the volume of the object written in terms of x

The graph of the function

The solutions of the equation including the algebraic work used to find the solutions.

Answer 14

The instructions should mention what they mean by "x". Read over the problem carefully and look for any mention of "x".

Answer 15

ok

Answer 16

It just says to write it in this form.... x(x ) (x )

Answer 17

It sounds like they want you to write the length, width and height as x, (x+a) and (x+b)
(for example).

Do they say x is the width, length or height? Or can you choose any of the 3 to be x ?

Answer 18

No it says x is the (wlh) not to choose any of the 3

Answer 19

Take a screen shot of the instructions and post them here.

Answer 20

won't let me paste it here :/

Answer 21

Hold on!

Answer 22

What does the first line of 3) say ?

Answer 23

It says: "Rewrite the formula using the variable x for the length. Substitute the value of the volume found in step 2 for V and express the width and height of the object in terms of x plus or minus a constant. For example, if the height measurement is 4 inches longer than the length, then the expression for the height will be (x + 4). "

Answer 24

Just the first sentence.

what does it mean
***using the variable x for the length***

Answer 25

Uh...idk

Answer 26

It means "let x be another name for the length"

what is the length for your box ?

Answer 27

well its not the length of my boy im trying to find it's my partner's box (cause we had to find each other's box)

Answer 28

The length of his is 12 inches

Answer 29

so call the length x, x = 12

what is the width ?

Answer 30

Width = 8in

Answer 31

now the interesting part:
we want to write
width= (x+a)
width is 8, x is 12, so you know enough to figure out what a is.

8 = 12 + a
what is a ?

Answer 32

4

Answer 33

are you saying
8 = 12+4 ?

Answer 34

Yes

Answer 35

is that what you calculator says?

Answer 36

no I didn't use a calculator

Answer 37

I'm supposed to use a calculator for this? O.o

Answer 38

No, you should be able to do this without a calculator. But 12+4 is not 8

Answer 39

I'm confused :s

Answer 40

you want a number that when we add it to 12 we get 8

the number has to be a negative number

Answer 41

oh so negative 4?

Answer 42

yes, 12-4= 8

(if you can't do this, you can at least use a calculator to check... but I would learn how to do it with out a calculator)

so far we have
length= x
width= (x-4)

what will the height be ?

Answer 43

h = 2in

Answer 44

yes, h= 2, but you want to write it like this: (x+a)= 2
x is 12, what must a be to get 2?

Answer 45

your saying 2-a = ?

Answer 46

no. you want height = (x+a)

you need to find the negative number "a" that makes (x+a)= h

Answer 47

so what + a = 2?

Answer 48

x, (and remember x is the length, and the length is 12)

Answer 49

oh ok so 12 + a = 2
ok so a = -10

Answer 50

yes

(x-10) = 2
so you can replace height (which is 2) with (x-10)

your volume is
192= L*W*H
but you can replace L with x, W with (x-4) and H with (x-10)
your new equation is
192= x (x-4) (x-10)

Answer 51

OMG THANK YOU FOR YOUR HELP!!

Answer 52

that is the answer for part 3.

For part 4, you must multiply out (use FOIL if you know it).

You should post part 4 as a new question, so people can help you if you get stuck.

Good luck, but I have to log off for a while...

Answer 53

That's exactly what i was about to do and np! Thanks again! :D