15n > 12n + 18
3n > 18
n > 6
Use the law of cosines to find a:

So to use the given numbers you get:

Which would come out to equal about 35.94
so a=35.9
Answer: No, Mai needs to solve the problem.
Step-by-step explanation:
2x+2=x+1 - subtract 2 from both sides
2x=x-1 - subtract x from both sides
x= -1 - solution