Answer:
The order of operations is PEMDAS
First step is to do everything is parenthesis or brackets
5+{2*[(5-1)+6]}/4
{2*[(5-1)+6]}
First you would go 5-1=4, because that is the first equation that is in parenthesis by itself. 
{2*[4+6]}
Next you would go 4+6=10, because that is your next smallest bracket
{2*10} 
Last you would go 2*10=20
Your equation now looks like this
5+{20}/4
In PEMDAS your next step is exponents, but we don't have any so we go on to the next one which is multiply/division 
5+5 
You would go 20/4=5
Last step is to add/subtract
5+5=10
Your final answer would be 10
Hope this helps ;)
Step-by-step explanation:
 
        
             
        
        
        
Answer:
exact form: 9988/23
decimal form: 434.26
mixed number form: 434 6/23
Step-by-step explanation:
 
        
                    
             
        
        
        
n = 66
Step-by-step explanation:
you can make a proportion 3/99 = 2/x 

99 * 2= 198
3 * x = 3x
so the equation would be 198 = 3x
than do 198 ÷ 3 on ur calculator
so x (or n in this context) would equal 66
 
        
             
        
        
        
Answer:
Step-by-step explanation:
r=20/100=0.2<|1|

 
        
             
        
        
        
Answer:
$7.20
Step-by-step explanation:
3/5=0.6
0.6*12=7.20