Of course! Just study hard, exams are a big part of your grade most of the time! I also have exams
Answer:

Step-by-step explanation:
We are given with two equations
first equation is 
second equation is

we find the result of subtracting two equation
subtract the second equation from the first, so
first equation - second equation, multiply second equation by -1 and then add it with first equation


Now add both equations, we get

Answer: a popcorn is $9
Step-by-step explanation:
soda is $6
1x54=54
2x27=54
3x18=54
6x9=54