Hello,
the code is
void setup() {}
void loop() {}
not sure it will do what you want, but it will definitely compile.
None of the Arduino has power, so you just don't need them at all anyway 
do yourself a favour and please read How to get the best out of this forum and modify your post accordingly (including code tags and necessary documentation for your ask).
Yes. The HC-SR04 ultrasonic rangefinder uses two I/O pins. The relay module uses one I/O pin. The servo uses one I/O pin and one timer. Most Arduino models have more than four I/O pins and more than one timer so they should all work on a single Arduino.
Use the built-in Servo library for the servo. Examples are in File-> Examples-> Servo.
Use digitalWrite() for the relay. HIGH is one way, LOW is the other.
You can use a third-party library like NewPing for the ultrasonic rangefinder but most examples use digitalWrite() and pulseIn().
If you are combining existing sketches, you'll have to come to some understanding of both, and take care doing.
Arduino combine two sketches
to get an idea of how to,proceed.
a7
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