Try to start by reading the manual it came with. If it didn't come with a manual, then your teacher in school will teach you how to use it for specific commands. Otherwise it's just like using a regular calculator but with the ability to do more things, what do you need to know on it?
        
             
        
        
        
Step-by-step explanation:
25 plus 25 equal 50 so 50 percent
 
        
             
        
        
        
Answer:
A and C
Step-by-step explanation:
A: 5 tens = 50
9 tenths = 0.9
6 hundreths = 0.06
= 50.96
C: 5*10 = 50 + 9 * 1/10 = 0.9 + 6 * 1/100 = 50.96
 
        
             
        
        
        
Answer:
-21
Step-by-step explanation: a negative times a positive will always be a negative
 
        
             
        
        
        
Answer:
4
Step-by-step explanation: