Answer:
Evaluating Exponents. An exponent is a number that tells how many times the base number is used as a factor. For example, 34 indicates that the base number 3 is used as a factor 4 times. To determine the value of 34, multiply 3*3*3*3 which would give the result 81
 
        
             
        
        
        
Answer: each pen costed him 2 dollars
Explanation: 24 - 10 = 14
14 / 7 = 2 $ per each pen
        
             
        
        
        
Step-by-step explanation:

 
        
             
        
        
        
Answer:
200
Step-by-step explanation:
55 / 5x = 20
5x=1100
x=200