Can't decide whether to use focus or focuses in this sentence
Is the word "management" singular or plural?
Enumerate paragraphs and subparagraphs like sections but with letters How to import a .max model into Blender? How do I set a background image while I am editing? How do I put a backdrop behind the model that I am creating so that I can compare the picture to the model while editing? Would someone give a thorough explanation of 1.14 Minecraft's /data modify? Execute command in remote active terminal Suppose you have a terminal emulator (T1) open with a PID of 6350.  From another terminal, type this command (C1):  echo "ls\n" &gt; /proc/6350/fd/0   This writes ls and the new line in T1 but does not execute it. Why?  I also tried using cat|bash with echo "ls\n" &gt; /proc/catid/fd/0 but it is still not executed.  How can I echo the command into another terminal and have the command executed?  possible answer :  $ mkfifo toto; $ bash &lt; toto; $ echo "ls" &gt; toto;   In this case you cannot write anymore directly in the terminal (everything is displayed the same way the command (C1) displayed thing in this terminal. Is there a preinstalled or automatic firewall? Does Ubuntu come with a preinstalled or automatic firewall? If not, do I need one?   I've read some articles about the advantages of Linux over other operating systems about security (no need to have antivirus, ...) but would like to be sure. What could cause a microcontroller to unexpectedly reset? One particularly irritating variety of bug in a microprocessor-controlled system is for the microprocessor to unexpectedly reset. An important tool for debugging this kind of problem is a list of possible causes. What could cause a microcontroller to unexpectedly reset? How to restore a system after accidentally removing all kernels? I was trying to delete old kernels, but I must have deleted all of the kernels on my Ubuntu 11.04 laptop. Is there any way to fix this via USB boot or mounting hard drive on another system? Why can `root` run any command as any user without providing password? My /etc/sudoershas content:  Defaults        env_reset Defaults        mail_badpass Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"  # Host alias specification  # User alias specification  # Cmnd alias specification  # User privilege specification root    ALL=(ALL:ALL) ALL  # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL  # Allow members of group sudo to execute any command %sudo   ALL=(ALL:ALL) ALL  # See sudoers(5) for more information on "#include" directives:  #includedir /etc/sudoers.d   There is no rule above specifying NOPASSWD. I was wondering  why user root seem to be able to execute any command as any user without providing password?  Thanks. Subdivision surface modifier problem Hello!   I've recently started learning Blender and faced one problem.  After applying subdivision surface modifier I have plenty of extra faces. I've watched some teaching videos and I suppose additional faces shouldn't be added. Is it OK ? How to avoid this problem if it isn't. Is it possible to extend a tourist Schengen visa (12 more days)? In the King James version of the Bible there is a verse like this:     The Lord is my strength, and my fortress, and my song. And He is become my salvation.   Is it still feasible to use "is become" instead of "has become" and what is the semantic difference? What's the easiest way to figure out if a window is opened modally or not?  CLARIFICATION:  I open a window calling   myWindow.ShowDialog();   I have a footer with an "OK" &amp; "Cancel" button that I only want to show if the window is opened modally. Now I realize I can set a property by doing this:  myWindow.IsModal = true; myWindow.ShowDialog();   But I want the window itself to make that determination. I want to check in the Loaded event of the window whether or not it is modal.  UPDATE  The IsModal property doesn't actually exist in a WPF window. It's a property that I have created. ShowDialog() blocks the current thread.   I'm guessing I can determine if the Window is opened via ShowDialog() by checking if the current thread is blocked. How would I go about doing that? For a 3D scene in the world coordinates, its View Reference Point $\mathrm{VRP}$ is at $(5,-2,1)$, and a viewer is looking towards point $A=(1,1,1)$. Construct a transform matrix which will map world coordinate points to a right-handed $(UVN)$ viewing space, so that $\mathrm{VRP}$ is the origin, the line joining $\mathrm{VRP}$ to $A$ is the positive $N$ axis, and the view-up Vector is $(0,0,1)$.   To my knowledge, the final answer should be a single transform matrix. To calculate the final matrix, I first find the matrix which translates the coordinate system to the to the origin in homogeneous matrix form:  Translation matrix:  $$ T=         \begin{bmatrix}         1 &amp;0 &amp;0 &amp;-5 \\         0 &amp;1 &amp;0&amp; 2 \\         0 &amp;0 &amp;1 &amp;-1 \\         0 &amp;0 &amp;0 &amp;1 \\         \end{bmatrix} $$  Using the unit vectors of the coordinate axes, the resulting rotation matrix is:  $$ R=         \begin{bmatrix}         -0.6 &amp;-0.8 &amp;0 &amp;0 \\         0 &amp;0 &amp;0 &amp;1 \\         -0.8 &amp;0.6 &amp;0 &amp;0 \\         0 &amp;0 &amp;0 &amp;1 \\         \end{bmatrix} $$ Then the final matrix (the final answer for full marks) would be the rotation matrix multiplied by the translation matrix:  $$ M=         \begin{bmatrix}         -0.6 &amp;-0.8 &amp;0 &amp;1.4 \\         0 &amp;0 &amp;0 &amp;1 \\         -0.8 &amp;0.6 &amp;0 &amp;5.2 \\         0 &amp;0 &amp;0 &amp;1 \\         \end{bmatrix} $$ Is my method and final answer correct?    Following the answer to this question, I have calculated the translation matrix:  $$ T= \begin{pmatrix} 1 &amp; 0 &amp; 0 &amp; -5 \\ 0 &amp; 1 &amp; 0 &amp; 2 \\ 0 &amp; 0 &amp; 1 &amp; -1 \\ 0 &amp; 0 &amp; 0 &amp; 1 \\ \end{pmatrix} $$  I have calculated the rotation matrix:  $$ R= \begin{pmatrix} -0.6 &amp; -0.8 &amp; 0 &amp; 0 \\ 0 &amp; 0 &amp; 1 &amp; 0 \\ -0.8 &amp; 0.6 &amp; 0 &amp; 0 \\ 0 &amp; 0 &amp; 0 &amp; 1 \\ \end{pmatrix} $$  But what would the final transformation matrix $M$ be? My lecture slides tell me it would be rotation matrix multiplied by translation matrix, with the last column multiplied by $-1$ except for the $1$. This would equal:  $$ M = R \times T =  \begin{pmatrix} -0.6 &amp; -0.8 &amp; 0 &amp; -1.4 \\ 0 &amp; 0 &amp; 1 &amp; 1 \\ -0.8 &amp; 0.6 &amp; 0 &amp; -5.2 \\ 0 &amp; 0 &amp; 0 &amp; 1 \\ \end{pmatrix} $$  But the answer here just adds them together somehow. Which one is correct? Can you use Wish to duplicate a spell at a higher level? Wish allows you to duplicate the effects of any spell L8 or lower. Does that include a lower-level spell, cast at L8? Say, as a Wizard, casting Heal at L8.  I'm leaning towards yes, but it wouldn't be the first time I assume the wrong answer... Customizing tray/taskbar date display in Ubuntu with GNOME 3 On previous versions I had the date displayed. Now it just shows the current day but not the day's number or the month.   Is there a way to customize the clock or tray/taskbar more in GNOME shell on Ubuntu 17.10 and later? Why does light of high frequency appear violet? Error with square bracket in table \begin{table}[ht] \makebox[\textwidth][c]{     \begin{tabular}{ccccc}         \hline         \hline         [] &amp; [] &amp; [] &amp; [] &amp; []\\         [] &amp; [] &amp; [] &amp; [] &amp; []\\         \hline         \hline     \end{tabular} } \caption{test} \end{table}   I cannot run the above code, latex returned an error about missing number, but I can't see anything I am missing.  And the weirdest thing is that  \begin{table}[ht] \makebox[\textwidth][c]{     \begin{tabular}{ccccc}         \hline         \hline         [] &amp; [] &amp; [] &amp; [] &amp; []\\         \hline         \hline     \end{tabular} } \caption{test} \end{table}   This code works.  Anyone have any idea? How to add a PPA on a server? The server version of Ubuntu does not have the  command. How can I add a  (PPA) to the server without this command? In Java, you can qualify local variables and method parameters with the final keyword.  public static void foo(final int x) {   final String qwerty = "bar";  }   Doing so results in not being able to reassign x and qwerty in the body of the method.  This practice nudges your code in the direction of immutability which is generally considered a plus. But, it also tends to clutter up code with "final" showing up everywhere. What is your opinion of the final keyword for local variables and method parameters in Java?