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Today,
12:39 AM
calc67x
started a thread
Trouble with even and odd functions
in
Calculus
I have this question: If f is an odd function and g is an even function, please find the value of the following interval 9 to -9 (f(x) +g(x))...
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0 replies | 8 view(s)
Yesterday,
11:27 PM
yma16
replied to a thread
find s(x)=1/x+4/x^2+9/x^3+16/x^4+... (x>1).
in
Calculus
and it is more direct. Thanks.
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10 replies | 240 view(s)
Yesterday,
09:44 PM
Dr.Peterson
replied to a thread
Test Statistic for Proportion Formula help.
in
Probability / Statistics
The hypothesized value is the value that is hypothesized: that is, the value that is supposed for the sake of comparison. The null hypothesis here...
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1 replies | 37 view(s)
Yesterday,
07:33 PM
Frosty
started a thread
Test Statistic for Proportion Formula help.
in
Probability / Statistics
Sup everyone, first post. 4) According to the CDC, 31% of all traffic related deaths were alcohol-related. A sheriff notices that, among the 44...
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1 replies | 37 view(s)
Yesterday,
06:55 PM
sinx
replied to a thread
percentage and money problem
in
Arithmetic
ZM=Zach's Money (ZM-0.40ZM)=after store A (after store A)-(after store A)0.25=after store B ............and so on
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3 replies | 93 view(s)
Yesterday,
03:04 PM
j-astron
started a thread
Covariance of the Sample Mean of Two Random Vectors
in
Probability / Statistics
Hello everyone, This is not homework, it's a real problem I encountered in data analysis. I'll try to state the problem as clearly as possible,...
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0 replies | 51 view(s)
Yesterday,
02:12 PM
JeffM
replied to a thread
find s(x)=1/x+4/x^2+9/x^3+16/x^4+... (x>1).
in
Calculus
This question is a mess. Do you mean \text {Given } \displaystyle n \in \mathbb Z^+, \ x > 1, \text { and } s_n(x) = \sum_{j=1}^n...
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10 replies | 240 view(s)
Yesterday,
02:11 PM
j-astron
replied to a thread
Average and standard deviation
in
Probability / Statistics
Hi Erwin1998, welcome to the forum. It's been a while since I've had to think about bending moment (Introductory Mechanics, basically). But having...
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2 replies | 169 view(s)
Yesterday,
01:28 PM
tkhunny
replied to a thread
percentage and money problem
in
Arithmetic
Rule #1 - If you don't know what it is, give it a name! "How much money did Zack start with?" I don't know. That's the point of the problem...
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3 replies | 93 view(s)
Yesterday,
01:24 PM
tkhunny
replied to a thread
find s(x)=1/x+4/x^2+9/x^3+16/x^4+... (x>1).
in
Calculus
In the limit, you can also use older ideas. 1) 1/x + 4/x^2 + 9/x^3 + 16/x^4... = S 2) 1 + 4/x + 9/x^2 + 16/x^3 .. = Sx Subtracting 2) from 1)...
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10 replies | 240 view(s)
Yesterday,
12:56 PM
Dr.Peterson
replied to a thread
percentage and money problem
in
Arithmetic
Take it step by step. Suppose he started with $100. How much did he spend at store A? How much was left? Then continue. Then you might think about...
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3 replies | 93 view(s)
Yesterday,
12:36 PM
bssubibe
started a thread
percentage and money problem
in
Arithmetic
need help on how to solve it? Zach went into store A and spent 40% of his money. He then spent 25% of his remaining money at store B. He then...
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3 replies | 93 view(s)
Yesterday,
11:25 AM
Dr.Peterson
replied to a thread
Simple Trig Proof
in
Geometry and Trig
It isn't clear exactly what your teacher is asking you to do, and what you did. There are many ways to prove any identity. My impression is that...
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3 replies | 185 view(s)
Yesterday,
11:19 AM
Dr.Peterson
replied to a thread
find s(x)=1/x+4/x^2+9/x^3+16/x^4+... (x>1).
in
Calculus
I think you confused us by not saying what you were told to take the derivative of! You seemed to be mentioning the simpler sum in passing, as a...
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10 replies | 240 view(s)
Yesterday,
08:44 AM
TamTam
replied to a thread
twice continuously differentiable
in
Probability / Statistics
Hello, I was wondering if someone could explain to me how I should interpret the following 'To ensure the existence of a unique closed-form...
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1 replies | 58 view(s)
Yesterday,
08:32 AM
TamTam
started a thread
twice continuously differentiable
in
Probability / Statistics
Hello, I was wondering if someone could explain to me how I should interpret the following: 'To ensure the existence of a unique closed-form...
see more
1 replies | 58 view(s)
Yesterday,
08:11 AM
HallsofIvy
replied to a thread
Laplace's equation: △u =1r∂u∂r+∂2u∂r2+1r2∂2u∂ϕ2
in
Calculus
You could, at the very least, have put "/" to indicate fractions and derivatives: \left(1/r\right)\partial u/\partial r+ \partial^2 u/\partial^2r+...
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1 replies | 218 view(s)
Yesterday,
06:32 AM
Harry_the_cat
replied to a thread
Proof for Double Angle Formulae in a diagram
in
Geometry and Trig
By "next question" I meant (c).
see more
5 replies | 158 view(s)
Yesterday,
05:23 AM
Masaru
replied to a thread
Proof for Double Angle Formulae in a diagram
in
Geometry and Trig
Oops. Thank you for pointing out this error. Yes, you are right. The second question is easier than the first one, so this one should be the...
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5 replies | 158 view(s)
Yesterday,
04:34 AM
Harry_the_cat
replied to a thread
Proof for Double Angle Formulae in a diagram
in
Geometry and Trig
No 2* here
see more
5 replies | 158 view(s)
Yesterday,
04:31 AM
Harry_the_cat
replied to a thread
Proof for Double Angle Formulae in a diagram
in
Geometry and Trig
In my opinion, it's a bit of a silly way to pose the question. Rather than consider cos (theta), consider sin (theta) in triangle ANP. That is...
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5 replies | 158 view(s)
Yesterday,
04:08 AM
Masaru
replied to a thread
Proof for Double Angle Formulae in a diagram
in
Geometry and Trig
Sorry, but I have finally worked it out, so I do not need help any more. My working is as follows: The triangles ANP and AMO are actually...
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5 replies | 158 view(s)
Yesterday,
03:49 AM
ketanco
replied to a thread
exponential problem
in
Intermediate/Advanced Algebra
yes i was able to solve it like this. thanks !
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4 replies | 180 view(s)
Yesterday,
03:45 AM
ketanco
replied to a thread
exponential problem
in
Intermediate/Advanced Algebra
no sorry, we are not allowed to use logs but thanks
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4 replies | 180 view(s)
Yesterday,
02:18 AM
Erwin1998
replied to a thread
Average and standard deviation
in
Probability / Statistics
I have calculated that the minimum bending moment is 105 kn / m. (beam L = 10.5 m) And that the maximum bending moment is 115 kn / m. (beam L = 11.5...
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2 replies | 169 view(s)
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