In a two-point source interference pattern, a certain nodal point is located 25.0 m from one source and 17.5 m from the other. If the wavelength is 5.0 m, on what nodal line is the point located?
Like in Java you'd have
String myString = "hello " + integerVar;
where integerVar is and integer variable; you're using a + to connect the two. How do you do this in PHP?