Worm- its a piece of self-replicating malware.
Answer:

Explanation:
Given
Mass of satellite 1 = 5.3 * 10¹²kg
Mass of satellite 2 = 3.5 * 10⁸kg
Distance between them = 1,800 m
Required
Gravitational Force between them.
The gravitational force between them is calculated as thus;

Where G = Gravitational Constant




Substituting these values in the above formula;
becomes





---- Approximated
Hence the gravitational force between them is 
.exe Indicates a windows executable file. These files are compiled in a variety of different programming languages and can accomplish a variety of tasks. .msi Files are database files that have pre packed dependencies, code, etc that is used by the Windows Installer to install a program package onto the host PC. .msp Indicates a Miscrosoft Patch file that may be used for patching or changing a program/firmware that pre-exists on the host PC. .inf Indicates an information file that is commonly used by programs/installers to outline the parameters for the program/installation to run.
Answer:
I'm guessing C
Explanation:
It just makes the most sense to me, but please don't be really confident with it, I'm in 6th grade. I'm really sorry if I'm incorrect.
Answer: How is someone suppose to help those aren't straight questions theres a whole other site you have to go to for that.