Mathematics - 28 November 2007

3x^2 - 2x = 10

I did.

x = 2 (2)^2 - 4 (3) (10) divided by 2 ( 3)

x = 2 4 - 120 divided by 6

I got 2 + 4.3 divded by 10 equals 0.83

2 - 6 divided by 6 equals 0.6

The final answers I got are 0.83 and 0.6 is that correct, if not could someone please help me.

2007-11-28 15:02:19 · 10 answers · asked by gizzie76 1

????

2007-11-28 14:56:27 · 1 answers · asked by teendeviant 3

i don't know how to do infinite products. the three examples i have are:

Product of: (1-1/n^2)

Product of: ( (n^3-1)/(n^3+1) )

Product of: ( 1-x^(n^2) ) where |x|<1

for the first one i have a ridiculously over complicated method similar to the Wallis product but there must be another way...

Can anyone help?
Thanks

2007-11-28 14:55:38 · 2 answers · asked by mongrel73 1

of* 32ft^3, to be welded from quarter-inch plate, and weigh no more than necessary. find the dimensions.

2007-11-28 14:55:11 · 2 answers · asked by iqbalkhanayesha 2

I looked up the question on Yahoo Answers and they did not specify how many minutes it took to get that figure.

2007-11-28 14:51:26 · 1 answers · asked by alex_b_michel 1

How many ways can 81,000 be written as the sum of two positive integer squares? Prove your answer.

:)

Hint: Some of my recent prior questions.

2007-11-28 14:46:43 · 4 answers · asked by Curt Monash 7

i have this scientific calculator casio fx 991 MS. I wanted to know how to do antilog or inverse log with this calculator. Please help.

2007-11-28 14:30:35 · 4 answers · asked by Priyanka P 1

List the unique solutions to 1000 = a^2 + b^2, where a and b are positive integers. Prove that that's all of them.

Hint: Some of the questions I've asked recently.

2007-11-28 14:24:40 · 5 answers · asked by Curt Monash 7

Prove your answer.

2007-11-28 14:22:54 · 2 answers · asked by Curt Monash 7

2007-11-28 14:18:45 · 11 answers · asked by hpdancerfreak 1

2007-11-28 14:14:57 · 8 answers · asked by anonymous 2

Suppose you have an examination with R questions on it. Suppose each question requires you to know F pieces of information in order to get it right. (and there are F pieces of info for each question, i.e. you need to get all the parts right to get the question right)

Can you write a closed formula to calculate the probability of getting C questions correct if you know L pieces of information out of the total F*R?
Or, can you write a closed formula to calculate the probability of having known L pieces of information given that you got C questions correct? (then you can flip it with Bayes' Theorem to the first one)

The answer must be valid for F and R being any positive integers. I'd also need to know why the formula works. Thanks in advance!

2007-11-28 14:08:05 · 1 answers · asked by Anonymous

i don't understand this...at all. work please.

(3 sin X + cos 3X) / (cos X - sin X) = 1 + 2 sin 2X

i'm supposed to solve/prove the identity?

2007-11-28 14:05:11 · 1 answers · asked by bluenecklace 2

Show that the only closed and open subsets of R are the empty set and R itself.

2007-11-28 13:49:50 · 1 answers · asked by moshi747 3

2007-11-28 13:49:32 · 1 answers · asked by J 4

2007-11-28 13:46:03 · 4 answers · asked by funnybonez93 2

Help to solve.
Thank you!!

2007-11-28 13:42:11 · 5 answers · asked by Michele 1

- square root of 256. the symbol is given for square root. Will the answer will be -16 or not a solution? if something else, what is it then?

2007-11-28 13:41:37 · 4 answers · asked by Anonymous

(t(12((t^2)-1)^5))-(((t^2)-1)^6)/(t^2)
this is what i have so far and my computer says its not right...can anyone help me please!!!

2007-11-28 13:40:49 · 3 answers · asked by peaceout34453 1

would you get the same answer?

2007-11-28 13:37:01 · 2 answers · asked by a 3

Ok here is a problem I'm faced with. 14,000 m2 = ? km2

Fourteen thousand meters squared is equal to blank kilometers squared.

I need intsrutions on how to do this. I'm completley confused.

2007-11-28 13:35:44 · 2 answers · asked by Shello 3

What quantity must be added the following expression to make it a perfect square trinomial?

x2 - 12x

2007-11-28 13:35:24 · 5 answers · asked by ry ry 3

Try this out =D!

Given that D_n + D_(n-1) + ... + D_2 + D_1 mod 3 = 0

Prove that:
D_n * 10^(n-1) + D_(n-1) * 10^(n-2) + ... + D_2 * 10 + D_1 is divisble by 3 also.

2007-11-28 13:27:48 · 4 answers · asked by UnknownD 6

The derivative of a power formula was derived for integer exponents, but works for any rational constant exponent. Demonstrate that this is true for y=x^(13/7) by first transforming the equation so that it involves only integer exponents, then differentiating implicitly with respect to x

2007-11-28 13:23:53 · 2 answers · asked by imagination_inevitable 1

2007-11-28 13:18:25 · 6 answers · asked by funnybonez93 2

Solve inequality.

-10.7 > x/-4

x/1.3 > 7.1

-3.8x > 28.5

2007-11-28 13:14:57 · 5 answers · asked by Anonymous

2007-11-28 13:12:41 · 7 answers · asked by Chuck B 2

ok can someone please tell me the prime numbers between 1 and 30 this was on a test and i think i did it right but she marked it wrong..

2007-11-28 13:12:31 · 8 answers · asked by blue_Eyes03 2

im having some trouble i think the answer is 144x+11 but i'm not sure if i'm right

2007-11-28 13:10:58 · 8 answers · asked by me 2

Consider the curve defined by -8x^2+5xy+y^3=(-)149
a) Find dy/dx
b) Write an equation for the line tangent to the curve at (4,-1)
c) There is a number k so that the point (4.2, k) is on the curve. Using the tangent line found in part (b), approximate the value of k.
d) Write an equation that can be solved to find the actual value for k so that the point (4.2, k) is on the curve.
e) Solve the equation found in part (d) for the value of k.

I'm pretty sure i got parts a and b..... but need major help w/ the rest.....

2007-11-28 13:10:01 · 2 answers · asked by otsoccerplaya 2