If this is just an expression, then all you have to do is combine like terms, or groups of numbers and variables that have the same variable.
When simplified, you get the equation
-12+ 16r or
-18+6+3r+13r=16r-12
X<_ 6
X>_ 15
The answers look off because the app doesn't understand less than or equal to and greater than or equal to.
Answer:
D
Step-by-step explanation:

The phrase "up to" means less than or equal to since John cannot send more than 250 messages.