Mathematics - 18 September 2007

Also is an ACRE approximately 70 square feet?

THANKs in advance. (Developers are destroying the field/woods behind my apt. for houses)

2007-09-18 23:49:15 · 6 answers · asked by bereftcat 4

Here's what I've done so far:
(x-1)(x-1)(x-1)-(x-1)(x-1) <-- If there's an easier way, please tell =)
(x2-2x+1)(x-1)-(x2-2x+1)
x3-x2-2x2+2x+x-1-x2+2x-1
x3-4x2+5x-2...

I can't factor anything out )=...

THANK you guys! It means a lot.

2007-09-18 23:32:20 · 12 answers · asked by Anonymous

Three numbers form an arithmetic sequence having a common difference of 4. If the first number is increased by 2, the second by 3, and the third by 5, they form a geometric sequence. Find the original numbers.

2007-09-18 23:32:15 · 2 answers · asked by Askem 2

I'm stuck on a problem, because I don't really understand what mapping is so I don't know what I can and can't do:

The problem is this:
------------------------------
Suppose that f:R -> R is a map such that for all x,y in R (the real numbers)

f(x+y) = f(x) + f(y) and f(xy) = f(x)f(y)

Prove that f is either:
1) the identity mapping for all x in R. i.e. f(x)=x,
or
2) the zero mapping for all x in R. i.e. f(x)=0
------------------------
he gave us one hint, that somewhere in our proof that the fact that every positive real number is a square will be very useful.

I have no idea what to do and any help would be wonderful!

Thanks in advance!

2007-09-18 23:02:50 · 2 answers · asked by greeneggs4spam 3

x means times

2007-09-18 22:52:12 · 1 answers · asked by jojo 1

I don't understand.
Could somebody please explain it using an easy-to-understand example?
Thank you.

2007-09-18 22:42:42 · 4 answers · asked by I need answers 1

prove that the set {1,x,x^2} is linearly independent?
my confusion is
as we know X^2 -2x +1=0 or x^2+2x+1=0 then how i can show that
a(1)+b(x)+c(x^2)=0 implies a=b=c=0 for linearly independent. a,b,c are elements of field.
similarly how i show {1+x, 1+x+x^2} is linearly independent.

2007-09-18 22:32:11 · 5 answers · asked by amjad 1

1) integral x/(x+1)^1/2 dx
2) integral x^3(x^2+1)^1/2 dx
Please show the workings clearly, thanks

2007-09-18 22:04:09 · 4 answers · asked by Anonymous

2007-09-18 20:48:49 · 7 answers · asked by kastro 1

Help please..

2007-09-18 20:30:42 · 1 answers · asked by sam h 1

6c^3 - 3c^2 - 45c= 0

x^4 - 10x^2 + 9 = 0

a^4 + a^2 - 2 = 0

4m^4 + 17m^2 + 4 = 0


i would apreciate it if you show step by step on at least a few so i can get the rest....

2007-09-18 20:28:26 · 4 answers · asked by funkenstien 2

first i need to use the distributive property to rewrite each expression.....
1. 5(2x + 7)
2. 6x - 6y
3. 3(m + n)
4. 3p - 3q

and i need to know if when you are adding things up do you add the exponents up or keep them the same
example: 3x to the second power plus 2x to the second power......would it be 5x to the second power or 5x to the fourth power??

2007-09-18 20:25:59 · 6 answers · asked by haybish2012 3

1. prove that cosθ/(1-tanθ)=(cosθ-1)/(1-〖sec〗^2 θ)

2. simplify tanθ- cosθ/(1-sinθ)

3. find the equation of the tangent to the curve y=〖4x〗^2+
2x+sin x at x= n/3

2007-09-18 20:25:25 · 2 answers · asked by MAN T 1

2007-09-18 19:16:02 · 3 answers · asked by Heell yeaah! 3

Anybody knows where I can find a simplified proof of Minkowski inequality?

2007-09-18 19:12:52 · 2 answers · asked by earsanddrums 1

Solving Linear Equation problem HELP!

2007-09-18 18:59:17 · 13 answers · asked by Laura Yellow 1

2007-09-18 18:54:14 · 8 answers · asked by Anonymous

√56
√7 x √8= 2√2
so what's the reduced answer?

2007-09-18 18:52:13 · 10 answers · asked by Anonymous

2007-09-18 18:47:17 · 5 answers · asked by Allison L 1

An overseas phone call is charged at one rate (a fixed amount) for the first minute and at a different rate for each additional minute. If a 7 minute call cost $10 and a 4 min call cost $6.40, find each rate.

2007-09-18 18:28:56 · 5 answers · asked by j;lkj;lkj;lkj;lkj 2

2007-09-18 18:02:10 · 3 answers · asked by Anonymous

1) Name all subsets for {2,8}
2) Complex Fraction Problem: (x/y) - 1/ (x^2/y^2) -1 = ?????

2007-09-18 17:53:59 · 3 answers · asked by Jeff Mad. 2

solve the equation and show work...the exponent threw me off

2007-09-18 17:52:38 · 11 answers · asked by arod_69 1

2007-09-18 17:51:25 · 13 answers · asked by Rio 1

Why is it that

3/3 = 1
2/2 = 1
1/1 = 1

but

0/0 is not equal to 1.

how many lots of zero go into 0: 0 or 1? that's what it hinges on regardless of what your calculator says.

if 1 * 0 = 0 doesn't it follow that 1 = 0/0?

2007-09-18 17:45:55 · 13 answers · asked by Gruntled Employee 6

the pronumerals in the brackets represent powers.

2007-09-18 17:45:22 · 3 answers · asked by Jack H 1

The area of a rectangle is 18 square inches. The length of the rectangle is twice its width. Find the length and width of the rectangle.

2007-09-18 17:41:45 · 8 answers · asked by Anne 4

State the domain of [f*g](x) for f(x) = 1/(x-1)^2 and g(x) = x+3.

is it all real numbers??? thanks for helping

2007-09-18 17:37:44 · 4 answers · asked by apromiseibroke 1

How much oil should be mixed with 24 gallons of gas if recommended ratio of gasoline and oil is 50 to 1 ?

Please enter your answer as a number of gallons without the units.

2007-09-18 17:35:09 · 8 answers · asked by arod_69 1

A number in the given statement has been rounded from its actual value. Give the greatest and least possible actual values for the number.
17) The longest bridge in the United States is the Second Lake Pontchartrain Causeway in Louisiana. It is 125,000 feet long (rounded to the nearest 5000 feet).
please help with that problem ^

2007-09-18 17:34:14 · 4 answers · asked by Anonymous