What is answer for 8 / 4 (4-2) = ?    My answer is 4. But some says it's 1. And arguing each others. They even using some calculators for prove them. Even those calculators showing both 1 and 4 as result. What should I tell to those who saying 1? Or my answer is wrong?
What's the correct way to do division using a backslash? If I write $a/bc + d$, will that be equal to $(a/(bc))+d$?   Basically, if I place a slash, will I divide by what's directly behind the slash $(b)$, the term that's behind the slash $(bc)$, or everything after the slash $(bc+d)$?
Avoiding confusion over the term "Research Assistant" In Book 1, Artemis et al escaped from the time stop by drugging themselves to sleep.  In the same time stop, Julius Root "accidentally" plugged Briar Cudgeon with a tranquilizer dart.  Cudgeon fell asleep, but did not disappear from the time stop.  Why not? What is the best way to clean the sensor on a interchangeable lens camera (mirrorless or digital SLR)? I've got a couple of spots of dust on the sensor of my Canon 20D. A rocket blower isn't shifting them, and I'm ridiculously scared of some of the more direct methods for cleaning sensors — what methods/systems have you tried, and how successful have they been? Load a resource contained in a jar In my application I load resources in this manner:  WinProcessor.class.getResource("repository").toString();   and this gives me:  file:/root/app/repository   (and I replace "file:" with empty string)   This works fine when I run my application from the IDE, but when I run the jar of my application:  java -jar app.jar   The path becomes:  jar:/root/app.jar!/repository   is there any way to solve this problem?  I'll use the "repository" dir name in order to create this:  ConfigurationContext ctx = (ConfigurationContext) ConfigurationContextFactory.createConfigurationContextFromFileSystem(repositoryString, null);   In the same manner, I'll get one file name (instead of a dir) and I'll use it this way:  System.setProperty("javax.net.ssl.trustStore", fileNameString) Solving $\cos x=x$ I would like to know how can we solve the equation $\cos x = x$, without graphing. I know that  there would only be one solution, that is obvious, that too in between $0$  and $\frac{\pi}{2}$. Is there any real expression in finite terms [perhaps we call that closed form, I am not sure] that could give $x$ or $\cos x$. Although I have not studied Taylor series, I know that it only gives an infinite series, which is not what I want. I suspect that it could not be done, but can anyone explain me why?  Just for completeness, Wolfram Alpha, gives the approximate answer $x = 0.7390851332151606416553120876738734040134$, but fails to give a exact solution. "Outside" or "outside of"? I believe this to be fraud — hired, then asked to cash check and send cash as Bitcoin I have been "hired" by Nissan Motor as a key account specialist.  My first assignment is to cash two checks that I have received. Both were written by a customer who has already received the engines. The total is $2500. I am to cash the checks, get the money, take out my bonus and any other related expenses and deposit into a Bitcoin ATM. Then make copy of receipt and electronically send to my "manager".  I contacted a lawyer, was told to talk to the Department of Labor, who said they will not get involved, as this is between me and my employer. Any advice? Counting unique records across 2 columns and computing a score based on boolean values I have a table that looks like this in Google Big Query:  custID  InteractionDate Purchased?  Sales 1       20150312           F         0 1       20150312           T         200 1       20150314           T         150 2       20150221           T         400 2       20150221           F         0 2       20150221           T         120   ..that I need to transform to the following structure:   custID InteractionDate Success Sales  1     20150312          0.5    200  1     20150314           1     150  2     20150221         0.66    520   ..where in this second table the success column is defined as  count(purchase=Yes)/(count(purchase=Yes) + count(purchase=No)),   and sales is just the sum.  I'm quite new to BQ and no-SQL languages. I simply don't know how to do this, I've searched and seen examples that suggest using partition over but I simply haven't seen any example that does just this. Thanks a lot in advance. I have just updated (through Software Update) to Ubuntu 16.04 LTS from 15.10. There are random instances of screen flickering throughout usage. After noticing this issue, I installed Compiz Config Settings Manager, selecting Force fulls screen redraws (buffer swap) on repaint, which did nothing.   Is there any way this could be related to compiz settings or is this another issue?    EDIT: not fixed after clean install, upgrade to kernel 4.5.2, however screen flickering is reduced, it is every now and then (10 minutes apart). I will see if upgrading to kernel 4.6.0-994-generic will fix this.     EDIT: fixed as of kernel 4.6.2 generic,  currently running 4.7.2 without any issues. What exactly is a photon? Consider the question, .  The answers say, "an elementary particle" and not much else. They don't actually answer the question. Moreover, the question is flagged as a duplicate of,  &ndash; the answers there don't tell me what a photon is either. Nor do any of the answers to  mentioned in the comments. When I search on , I can't find anything useful. Questions such as,  look promising, but bear no fruit.  say things like, "the photon is an excitation of the photon field." That tells me  nothing. Nor does the , which says:     The photon is the quantum of the electromagnetic four-potential, and therefore the massless bosonic particle associated with the electromagnetic force, commonly also called the 'particle of light'...   I'd say that's less than helpful because it gives the impression that photons are forever popping into existence and flying back and forth exerting force. This same concept is in the  too - but it isn't true. As , "Virtual particles only exist in the mathematics of the model." So, who can tell me what a real photon is, or refer me to some kind of authoritative informative definition that is accepted and trusted by particle physicists? I say all this because I think it's of paramount importance. If we have no clear idea of what a photon actually is, we lack foundation. It's like what :     Photons seem to be one of the foundation ideas of quantum mechanics, so I am concerned that without a clear definition or set of concrete examples, the basis for understanding quantum experiments is a little fuzzy.   I second that, only more so. How can we understand pair production if we don't understand what the photon is? Or the electron? Or the electromagnetic field? Or everything else? It all starts with the photon.   I will give a 400-point bounty to the least-worst answer to the question. One answer will get the bounty, even if I don't like it. And the question is this:    What exactly is a photon? Nginx: Forward all Subdomains My code doesn't work with second level tld's like domain.co.uk Here is my conf:   # add www.   if ($host ~ ^(?!www)) {    rewrite ^/(.*)$ http://www.$host/$1 permanent;   }    # remove subdomain   if ($host ~ &quot;^www\.(.*)\.(.*\.([a-z]{2,4}|[a-z]{2}\.[a-z]{2}))&quot;) {    set $host_without_sub $2;    rewrite ^/(.*)$ http://www.$host_without_sub/$1 permanent;   } In my opinion the accepted answer should permanently stick as only the original question submitter has the ability to accept. K-means - comparing solutions with SSwithin elbow-method: minimum "too early", or non-monotonic curve Let $A,B$ be any two sets. I really think that the statement $|A|\leq|B|$ or $|B|\leq|A|$ is true. Formally:     $$\forall A\forall B[\,|A|\leq|B| \lor\ |B|\leq|A|\,]$$   If this statement is true, what is the proof ? Change Error Message on FBA Login page On the default FBA Login Page, when a user enters wrong username/password an error message gets displayed:      "The server could not sign you in. Make sure your Username and Password are correct, and then try again.".    I want to change this error message to simple text      "Invalid Username and Password".    How can I achieve this? Slope layer with false results in QGIS? After the DEM creation, I wanted to create slope layer.   However, the result has not satisfied me. I don't think the slope map is correct. Have you ever encountered false calculated terrain map?  This is the DEM:    And this is the slope layer. Is it possible to run Snow Leopard on a LATE 2011 MacBook Pro? I want to buy a new MacBook Pro, from Apple. However I want to run Snow Leopard instead of Lion.  I did some Google searches and found a few success stories of people who got SL to run on their early-2011 MBPs. I didn't find much of any experiences of people doing the same on a late-2011 MBP though, so I'm wondering (and really hoping!) if it's possible? How can I draw simple trees in LaTeX? I need to draw a tree, and constantly using dotty and including the PNGs is starting to be a pain. Is there a way to get LaTeX to draw it's own trees that doesn't involve learning an entirely new language like TikZ? Why do Lambertian Reflectors Privilege the Observer? SPSite and SPWeb object dispose inside foreach loop