D.36 60 .... because 6 times 6 is 36 and 6 times 10 is 60
        
                    
             
        
        
        
<h2>
Answer:</h2>
<u>The expression is</u><u> 5(40+80)</u>
<h2>
Step-by-step explanation:</h2>
The sum of 40 and 80 can be written as
(40+80)
and when we take the 5 times of the sum 
we can write as
5(40+80)
 
        
        
        
Answer:
7^(1-3+1) = 7^-3
Step-by-step explanation:
Here is the rule you should know: when multiplying powers of the same base you add the exponents ans when dividing powers of the same base you subtract the exponents. 
Also, if there is no number at the exponent, it is 1.
 
        
                    
             
        
        
        
Answer:
x=2
y=3
Step-by-step explanation:
9x2= 18, 6x3=18. 18+18=36