When there's more than one letter, and you just have to solve for one variable, you can just solve it like you would any other equation. Treat the other variables like numbers and add, subtract, multiply, and divide them to both sides of the equation in order to isolate the variable you want to solve for.
Let x equal the number of months
Total cost=$30 + $50x
X=5 months
So total cost= 30+50(5)=$280
Answer:a or possibly c
Step-by-step explanation:
It would be there is not enough information because you need the angles to find out what what degrees it has in it. Hope this helps :)