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post #1 of 45 (permalink) Old Aug 26th, 2009, 06:34 AM Thread Starter
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help with MATH!

is there anyone good @ math around that can help me with some problems please?





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post #2 of 45 (permalink) Old Aug 26th, 2009, 07:00 AM
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Re: help with MATH!

What problems?

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post #3 of 45 (permalink) Old Aug 26th, 2009, 07:27 AM Thread Starter
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Re: help with MATH!

ill post it tomorrow, is almost 4am and i decided to give up.





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post #4 of 45 (permalink) Old Aug 26th, 2009, 01:18 PM
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Re: help with MATH!

i love math hurrry up!

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post #5 of 45 (permalink) Old Aug 26th, 2009, 01:22 PM
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Re: help with MATH!

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Originally Posted by TheFifthAvocado View Post
i love math hurrry up!
right on.



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post #6 of 45 (permalink) Old Aug 26th, 2009, 01:47 PM
 
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Re: help with MATH!

Tzar, I'd take Sal up on her offer quick. She doesn't do charity often .
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post #7 of 45 (permalink) Old Aug 26th, 2009, 01:48 PM
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Re: help with MATH!

I'd love to help. Post your question NOW.

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post #8 of 45 (permalink) Old Aug 26th, 2009, 02:25 PM Thread Starter
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Re: help with MATH!

ok so i have 20 excersises to solve, only 10 left though.

ill post 3 for now . lol.

i have to clarify it has been over a year since i graduated from high school im trying to find my way back in college so.

1. A fram of uniform width borders a painting that is 20 inches long and 13 inches high. If the area of the framed picture is 368 square inches, find the width of the border.

What i did was. 20x13 = 260

368-260 = 108

108/20= 5.4
108/13= 8.3

8.3-5.4= 2.9 inches, but im not sure if its right.


2. Determine the constant that should be added to the binomial:

X^2 + 1/6^X

so that it becomes a perfect square trinomial. then write and factor the trinomial.

3. A box with a square base and no top is made from a square piece of cardboard by cutting 3-inch squares from each corner and folding up the sides. What length of side must be the original cardboard square have if the volume of thebox is 675 cubic inches.

4. 5X^4 - 45X^2 = 0.

5. Solve the ecuation.

X-2048-32.SQUARE ROOT of X = 0.

please post procedures.

god i feel so stupid. i know how to do this but i forgot everything i learned on highschool





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post #9 of 45 (permalink) Old Aug 26th, 2009, 02:49 PM
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Re: help with MATH!

Hmm, Let me try the first question..

I think for the first its you got 108 pixels for the border like you calculated.
Its uniform so with the variable X that is the border you weight, you need to "circle" the picture, so its (2*height + 2*length) * X = 108

height=13, length=20. So its should be 108/66?

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post #10 of 45 (permalink) Old Aug 26th, 2009, 02:53 PM
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Re: help with MATH!

let see
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post #11 of 45 (permalink) Old Aug 26th, 2009, 02:55 PM
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Re: help with MATH!

Quote:
Originally Posted by Meteor Shower View Post
Hmm, Let me try the first question..

I think for the first its you got 108 pixels for the border like you calculated.
Its uniform so with the variable X that is the border you weight, you need to "circle" the picture, so its (2*height + 2*length) * X = 108

height=13, length=20. So its should be 108/66?
Oh, BTW, with the calculation 2*height + 2*length you have the four corner pixels repeated twice, so really it should be 62 and not 66. So the answer should be 108/62 I guess.

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post #12 of 45 (permalink) Old Aug 26th, 2009, 03:05 PM
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Re: help with MATH!

4. 5X^4 - 45X^2 = 0.

5x˛(x˛-9) => x=0, x=3 or x=-3
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post #13 of 45 (permalink) Old Aug 26th, 2009, 03:35 PM
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Re: help with MATH!

1.

(20+x)(13+x) = 368
260 + 33x + x˛ = 368
x˛ + 33x = 108
x = 3

border width = x/2 = 1.5

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post #14 of 45 (permalink) Old Aug 26th, 2009, 03:37 PM
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Re: help with MATH!

is #2 written correctly?

I don't think it is. I'll do it how I think it should be written

x^2 +1/6x

complete the square

take half of 1/6 and square it

(1/6)/2 = 1/12
(1/12)^2 = 1/144

so:

x^2 +1/6x +1/144

factored: (x+1/12)(x+1/12)

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Last edited by Sally Struthers; Aug 26th, 2009 at 03:42 PM.
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post #15 of 45 (permalink) Old Aug 26th, 2009, 03:41 PM
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Re: help with MATH!

2.

x˛ + 1/6x + a = (x + b)˛

x˛ + 1/6x + a = x˛ + 2bx + b˛

b = 1/12

a = 1/144 = constant that should be added
x˛ + 1/6x + 1/144 = perfect square trinomial
(x + 1/12)˛ = factored into binomials

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Last edited by Kworb; Aug 26th, 2009 at 03:52 PM. Reason: oops, thanks Sally
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