# stupid

1. ### Feeling so stupid for being stumped...

Okay I tried to solve this problem but it seems unsolvable to me, please let me know if I missed anything. There's an object traveling through two mediums, say medium A and medium B. In medium A the object travels at 350% velocity. In medium B the object moves at 500% velocity. It takes 6...
2. ### a very stupid question

hi sorry for this stupid question but my brain is not working im writing a game the user collects coins and gets a point everytime they collect one and the game time is counted in integers the overall score is calculated at the end the player should get a higher score the faster he/she collects...
3. ### Simple (and stupid) question

Guys, just have a small question, might sound stupid but here it goes: If I have 1 - |-3 -4| , my answer would be 1-7 right? Thats what I think but I am not sure. The -7 becomes positive because of the abs. value, but then becomes negative again because of the sign? Any toughts? Thanks a lot...
4. ### stuck with statistics! think it wont take long to answer this; im just being stupid!

hi guys, i am giving in my 12000 word dissertation in 5 days and need to run some tests but completely forgotten how to do it!! i want to prove that there is a relationship between the number of friends a migrant has and how frequently they visit a site to make more friends. this is is the...
5. ### Stupid formula, I get the question but not the formula

So here i am again, yes with another retarde post in most of your eyes but I come here because I need help :( Here is the question. Consider the name "john smith" with j letters for the first name and k letters for the second name and where the space between the name is not part of the name...
6. ### Two algebra problems? Yes I am a little stupid and even if you can do one, that's ok!

1. Show that 21*18^(2x)+36*7^(3x) is divisible by 19 for all positive integers x 2. Find all pairs of odd integers m and n which satisfy the following equation: m+128n=3mn
7. ### Am I being really stupid or what? (Differentiation)

Hi t^{{\alpha}-1} dt When you differentiate that, its not ({\alpha}-1)t^{{\alpha}-2 ? Surely it is just 0 ? Or am I just being completely stupid..
8. ### Can't seem to get this stupid continuity problem...

Hey, Any help on this problem would be appreciated. For some reason I can't for the life of me solve any of these questions when an '=' sign is introduced: f(x) = {8x + 4 x < or = 9 and f(x) = {-4x + c x > 9 The question is : Find the value of 'c' that makes the function...
9. ### one of those "stupid" proofs

Hi all, I have to do this problem according to the first part of the Fundamental Theorem of Calculus. Fundamental theorem of calculus - Wikipedia, the free encyclopedia h(x)= (integral of 0 to x^2) sqrt(1+r^3) dr answer: f(x)=sqrt(1+r^3) h'(x)=f(x) h'(x)=sqrt(1+x^6)* 2x Am I right? I...
10. ### stupid test question.

i DO understand how to do this, i just cant remember how to get all of the numbers in the equation in order to solve it. "The population of a town is 10000 people. it grows at a rate of 1.4% per year for four years, what is the growth factor, b, for the equation y=a*bx (x being the small integer...
11. ### stupid normal distribution question

Computing conditional expectation... if I have X1,X2 iid normal with N(0,1) and I want to find E(X1*X2 | X1 + X2 = x) Can I simply say: X1 = x - X2 and thus E(X1*X2 | X1 + X2 = x) = E[ (x - X2)*X2) = E[ (x * X2) - ((X2)^2) ] <=> x*E[X] - E[X2^2] = 0 - 1 = -1 ???
12. ### Probably a stupid question...

So by the trigonometric identities, \sec \theta = \frac {1} {\cos \theta}, but according to my calculator, \sec 0 = 1.57, and \cos 0 = 1. how can this be, seeing as \frac {1} {1} = 1.57 isnt true??
13. ### plot multivariable function - stupid question?

Is is possible to plot a multivariable funciton? How? Sorry if this is a stupid question, but, as I have read in a forum signature "The only stupid question is the one you don't ask. The only stupid person is the one who pretends to know." (Happy) Thanks.
14. ### Stupid simple sine/cosine problem

Alright, so I have this right-angled triangle and I thought I did it right, but apparently I didn't, so any help would be great appreciated! I wanted to find B, So I just used b / SinB = c /sinC SinB = b / c SinB = sin^-1(38/63) I end up with 37.1, but the answers said I wanted...
15. ### Stupid Integral Help

I need to integrate \int5e^{x}sin\left(2x \right)dx, and I just cannot figure out what the trick is to it. I don't think it's any combination of integration by parts since e^{x} will always stay the same and the other function will oscillate back and forth between sin and cosine, and all that...

hi, what is the more "mathematical or scientific method to find LCM and HCF? instead of just thinking? I remember short division could do the job, but forget how to do so Hope someone explain me together with the concepts. Thanks!!!
17. ### Very stupid continuity question

Is the function (x^2 - 4)/(x + 2) continous at x=-2 ? I am doubtful because 1. It can be reduced to (X-2) so it is continous everywhere. 2. But on the other hand isnt continuity checked for the exact function without making changes to it? Cos if x=-2 then the original function is not...
18. ### Another Stupid Differentiaion Problem

Hey guys Sorry ...here's another differentiation problem i can't solve ><" ...i asked my friends but they have no clue and since it's the holz my teacher is inaccessible Although an example in the textbook showed a similar question, i can't seem to get the answer with the method shown...
19. ### Stupid question...how do I know when I'm done? Solving a polynomial equation

Am I supposed to solve for x? How do I know where to start, and how do I know when I am done?
20. ### This may be a stupid question, but...

How does (cosh squared x - sinh squared x) / (cosh squared x) equal 1 - ((sinh x / cosh x)^2) Help appreciated!