Mathematics - 12 September 2007

2007-09-12 09:25:38 · 9 answers · asked by Anonymous

Okay, here we go! I have NO IDEA how to solve this! Everything that I try yields the wrong answer!

(e^x + e^-x)/(e^x - e^-x) = 3

Please show me step-by-step how you're supposed to solve that! I'll pick a best answer TODAY! Thank you so much!

2007-09-12 09:24:31 · 8 answers · asked by Anonymous

Use the definition of the derivative to show how the formulas are obtained.

If f(x)=2X^2+X, then f'(x)= 4X+1

please help and also what do you think of my dress?

2007-09-12 09:19:30 · 5 answers · asked by fvsdf s 2

2007-09-12 09:19:27 · 5 answers · asked by aohk17 2

In an isosceles right triangle, the length of the hypotenuse is 81. Find the length of each leg

2007-09-12 09:16:19 · 7 answers · asked by Anonymous

I was just wondering if G. H. Hardy's "A Course of Pure Mathematics" was considered good for learning real analysis. I don't think I've had the best calculus preparation I could have had at a university.

2007-09-12 09:16:01 · 5 answers · asked by Me 2

1) x to the power of 3 + x to the power of 2 + x

So since x is subtitued by 1,is it..

1 * 1 * 1 + 1* 1 + 1 which would equal to = 3

2007-09-12 09:11:53 · 9 answers · asked by Jessie 1

can someone please explain as much as they can how to do these mathematical and algebraic sentences?

1.) 2y-1=1
2.)z/3 > 1
3.)a+2 not equal to 7
4.)x/4+2<5

2007-09-12 09:07:48 · 5 answers · asked by Anonymous

Distribute the following:  3(2x - 5).

2007-09-12 09:04:37 · 11 answers · asked by Anonymous

i dont have a good teacher.he says one thing and acutally confuses himself!he makes no sense so i need someone to explain these 4 questions to me!thankyou sooo much i really do appreciate your help!


1.)The difference between a number and 3 is not 6.

2.)The quotient of a number and 10 is 5.

3.)2 less than 3 times a number is less than or equal to 11.

4.)The perimeter of a square is 24 cm.Find the length of one side.

2007-09-12 08:54:20 · 7 answers · asked by Anonymous

Suppose the real valued function f is Riemann integrable, but not continuous, over [a,b]. Then, does there exist some c in (a,b) such that f(c) = [Integral (a^b)f(x) dx]/(b -a)?

I tried to prove this based on the fact that the set of discontinuities of f in [a,b] has Lebesgue measue 0, but couldn't come to a conclusion yet.

2007-09-12 08:50:29 · 1 answers · asked by Steiner 7

Hi! Here's an example of what I mean:

3^x = 2^(x-1)

I took the log of each side, yielding:

log 3^x = log 2^(x-1)

OR:

x log 3 = (x-1) log 2

But what do I do from here?!?!?!? PLEASE HELP! I'll pick a best answer TODAY!

2007-09-12 08:46:58 · 6 answers · asked by Anonymous

there are 30 kids in the class
2 are 130 to 140cm tall
15 are 140 to 150cm tall
12 are 150 to 160 cm tall and
1 is 160 to 170cm tall

so the tally is 2, 15, 12, 1

what on earth is the "frequency"???

10 pts if you can help the little shite, i mean he should bl**dy pay attention but i dont want him to end up thick! thank you

2007-09-12 08:40:27 · 12 answers · asked by Anonymous

2x+1/x-3
when i put this in the caluclator the graph is the isotope or the line that the graph can not reach is 3. That means that the two curve lines sould move to the right but when i do that it is not happening. What am i doing wrong.

2007-09-12 08:39:56 · 2 answers · asked by fvsdf s 2

Sigma (1 + sin n^2)/ sqrt n , n = 1, to 00

Does this series converge or not?

I am stuck on this one and I am not convinced of the previuos answer so I ask again hoping there are more mathematicians online. Thanks in advance.
Does the comparison test work here? If so, what is the inequality.
I know -1 < = sin n^2 < = 1
0 < = 1 + sin n^2 < = 2
making our an < = 2/ sqrt n, but that is useless. I am trying to get a uselful comparison, can someone help?

2007-09-12 08:35:01 · 5 answers · asked by Anonymous

I need to convert the two numbers to scientific notation:
HELP PLEASE.

3,900,000,000
0.00000418

2007-09-12 08:26:22 · 5 answers · asked by countess_von_katz 2

Something greater than 7 digits will be interesting!
But u'll have to give a genuine answer along with a proof or the source from where u got it. I am looking for serious and good answers so NO SPAM PLEASE!

2007-09-12 08:25:20 · 6 answers · asked by Bibo 1

Is there a relationship between how many sit-ups you can do and how fast you can run 40 yards?

a. The regression equation is 6.71 - 0.024x. Find the predicted time in the 40-yard dash for a subject who can do (i) 10 sit-ups, (ii) 40 sit-ups.

b. Interpret the y-intercept and slope of the equation in (a), in context.

c. Based on the slope in (a), is the correlation positive, or negative? Explain.

2007-09-12 08:20:38 · 3 answers · asked by goodguy083 1

What is the
1. degree- is it 6
2. list of terms
3. coefficients - 16 and 5 ?
4. constants- -1?

thanks

2007-09-12 08:16:11 · 6 answers · asked by Boo Radley 4

thanks if yu can help, i don't know where to begin

2007-09-12 08:02:10 · 7 answers · asked by Boo Radley 4

The length of a garden is 9ft longer than the width. If the area of the garden is 70 sq ft. What are the dimensions?

Any explanations

2007-09-12 08:01:13 · 15 answers · asked by Andrew F 1

2007-09-12 07:54:36 · 4 answers · asked by thenamelessrock 1

If f(x)=-x^2, what is x->infinity lim f(x)?
What is x->-infinity f(x)?

2007-09-12 07:50:53 · 2 answers · asked by fvsdf s 2

g(x) = 3 - x^2

g(t - 1)

______________________________...

heres what I did:

g(t-1) = 3 - (t-1)^2

"" = 3 - (t-1)(t-1)
"" = 3 - t^2 -t -t +1
"" = 3 - t^2 - 2t + 1
"" = -t^2 - 2t + 4
"" = t^2 +2t - 4

The answer in the book says it should be:
-t^2 +2t + 2
which would be the same as:
t^2 -2t -2

So where did I go wrong? I'm betting it has something to do with that "3 - " part.

2007-09-12 07:46:03 · 8 answers · asked by Matthew K 2

copy and find the missing numbers. find each pattern rule. Then find the 8th term
A)5,12,26_,110,222
B)300, 281, 262,_,224,205,

2007-09-12 07:44:55 · 3 answers · asked by Anonymous

put the answer in the lowest fraction terms

2007-09-12 07:41:41 · 7 answers · asked by P M 1

2007-09-12 07:38:44 · 4 answers · asked by Anonymous

Find the number of ways to rearrange the letters in the following word. ALABAMA

OK, there are 7 letters and 4 of them are A's three of them are not. Now what?

2007-09-12 07:18:20 · 3 answers · asked by Libby 5

What is the maximum value on the given interval.

Correct me where I'm wrong:

Endpoints:
f(0)=16
f(1)= -6.658

f'(x) = -32sin(2x)
-32sin(2x)=0

OK, this is where I'm spacing out.
Am I considering all possible values of x between 0 and 1 in the last equation?

2007-09-12 07:18:14 · 3 answers · asked by RogerDodger 1

How do u this?

2007-09-12 07:15:55 · 3 answers · asked by Anonymous