Answer:
25x10^18/4   or    6.25x10^18
Step-by-step explanation:
2.5x10^33x5x10^-15/2
12.5x10^18/2
 
        
             
        
        
        
Tia went home and said to her mom,"I learned that 10 to the power of 4 is the same as 40,000." 
Tia made a mistake in her thinking. Exponent represents the number of zeros.
 means we multiply 10 four times
 means we multiply 10 four times

For exponent 4, we put 4 zeros. So answer is 10,000.
 
        
                    
             
        
        
        
Answer:
40
Step-by-step explanation:
The number after 39, or 39 plus one, is 40.