Problems in $\sqrt{5x+4}=x-2$
Solving $\sqrt{x+5} = x - 1$
How can we run a command stored in a variable? $ ls -l /tmp/test/my\ dir/ total 0   I was wondering why the following ways to run the above command fail or succeed?  $ abc='ls -l "/tmp/test/my dir"'  $ $abc ls: cannot access '"/tmp/test/my': No such file or directory ls: cannot access 'dir"': No such file or directory  $ "$abc" bash: ls -l "/tmp/test/my dir": No such file or directory  $ bash -c $abc 'my dir'  $ bash -c "$abc" total 0  $ eval $abc total 0  $ eval "$abc" total 0 Question about probable fixed use of "what do you do?" and "how do you do?" Do we always have to use the question how do you do? fixed in greeting people? Can we ask it in other situations rather than greetings? Like when we are wondering how someone is doing the given task.  Do we always have to use the question what do you do? for asking about sojeone's job? Can we use it sonetimes instead of ** what are you doing?** Should actors in a game be responsible for drawing themselves? I am very new to game development, but not to programming.  I am (again) playing around with a Pong type game using JavaScript's canvas element.  I have created a Paddle object which has the following properties...   width height x y colour   I also have a Pong object which has properties such as...   width height backgroundColour draw().   The draw() method currently is resetting the canvas and that is where a question came up.  Should the Paddle object have a draw() method responsible for its drawing, or should the draw() of the Pong object be responsible for drawing its actors (I assume that is the correct term, please correct me if I'm incorrect).  I figured that it would be advantagous for the Paddle to draw itself, as I instantiate two objects, Player and Enemy. If it were not in the Pong's draw(), I'd need to write similar code twice.  What is the best practice here?  Thanks. Solving $f(x+y) = f(x)f(y)f(xy)$ Can I set up a Mac for a multi head / multi user environment? Show that $E(X)=\int_{0}^{\infty}P(X\ge x)\,dx$ for non-negative random variable $X$ Show that for a non-negative random variable $X$,   $$\mathbb E(X)=\int_0^\infty \mathbb P(X\ge x) \, dx.$$   I started with  $$\mathbb E(X)=\int_0^\infty x \, dF(x)=\int_0^\infty \int_0^x dt\,dF(x).$$ This is my try. What files should i put in a logo pack to give to clients? Should I put small, medium and large version of my logo as well as the vector file. Prove that if $d \mid n \in \mathbb{N}$, then $\varphi(d) \mid \varphi(n)$. I want to prove that if $d \mid n \in \mathbb{N}$, then $\varphi(d) \mid \varphi(n)$.  It's given that $d \mid n$, so we know that $n = dm$, for some $m \in \mathbb{Z}$. Now, I want to show that $\varphi(d) \mid \varphi(n)$, i.e. that $\varphi(n) = k\varphi(d)$, for some $k \in \mathbb{Z}$. Drawing a blank of where to go from here. Position an exampleblock in front of content I need to position an example block:  \begin{exampleblock}{}    Proposed and implemented \end{exampleblock}   Without disturbing other frame content. Something like:  -------------------- ------------- -------------------- -------------------------- -----------    --/============\--------- -----|            |-- -----| Proposed   |-------- -----| and        |-------- -----| implemented|------ -----\============/ -------------------- --------------------------    -----------------   Let it overlay the text behind it. And not to be taken into account during layouting.  Update The Claudio Fiandrino's way is not apropriate to me, because, i need an Itemize environment working inside, and it would be great, if block style is the same as theme-style. How to reinstall Windows 10 on new hard disk I've been using Windows 10 for a couple of month now (joined the Insider Preview).  Now my hard drive started ticking so I've bought a new SSD and I want to move the windows installation to the new hard drive, which has been connected to the computer (unpartitioned). I don't mind and I even prefer reinstalling it over again.   Since I have the free version of Windows 10 pro, can I still reinstall it anew? Does the windows 10 installation offer disk management and partition like the older Windows installations used to? How should I reinstall Winodws 10 x64 the easiest but still remain on free mode? How Can i make save and load for bge I probably need the help of a Python script to make this work.  What I want is: The player will be able to save and turn off the game, but continue from where they saved when they next log in. Items such as gold, weapons, etc. must be stored.  It feels like something hard to do and I am not managing to figure it out alone. Although I love problems and solving them, in this case I need help.  I know that BSE People should not  ask more questions.  But.  Is this stupid or must I have several Scenes in my game. Say that my player goes into a house. Should the house then be in another Scene, or should I move camera and player to inside the house from the same Scene?  Any advice would be very helpful. I have no one near me whom I can ask.  //  Robin W Find all solutions to the functional equation $f(x) +f(x+y)=y+2 $ Why is ATP the preferred choice for energy carriers? Why is ATP the most prevalent form of chemical energy storage and utilization in most cells? Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors? How to delay or slowly loop commands? Creation parameters menu greyed out When adding a UV Sphere mesh in Blender 2.8, the creation parameters menu on the bottom left of the attached image for this UV Sphere seems to be greyed out. Any idea why this might be? Thanks. Finite Summation of Fractional Factorial Series Should I vote to close a duplicate question, even though it's much newer, and has more up to date answers? Name for a word whose sound is contrary to its meaning On per-site metas, users are given a rank based on meta participation, and this ranking is seen on the default tab of the users page on each per-site meta. How is this participation numerically calculated to give a ranking? Is it by votes? Something else? Are community wiki posts included in this?