Step-by-step explanation:
1) 

2)

So,


3)


4)


5) 


Answer:
10
Step-by-step explanation:
Use order of Operations - PEMDAS
First, (2x3) = 6
Now you have, 1+6-(-3)
Then take the -(-3) and make it +3, cause a subtraction and negative sign make a positive.
Now you have, 1+6+3
Then add it all together to get 10
Oh OK
Perimeter = 2l + 2w = 44
l + w = 22
if l = 12 then w = 120/12 = 10
if l <_ 12 then w >_ 10
Its A
4 students per table
20/5 = 4 (students/tables = students per table)