Answer:
65
Step-by-step explanation:
 
        
             
        
        
        
Answer: 9
Step-by-step explanation: Basically what f(-2) means is -2 = x. So you put in -2 wherever x appears. This would turn the equation to -3(-2) + 3 which goes to 6+3. 
 
        
                    
             
        
        
        
Answer: 
Step-by-step explanation:
Since we have given that

Now, we know the rule for summation , we'll apply this ,

Now, it becomes geometric progression, so we us the formula for sum of terms in g.p. which is given by

So, our equation becomes ,

Hence ,

 
        
                    
             
        
        
        
14? 
17-12=5 
5x2=10
10+4 =14
        
                    
             
        
        
        
You can try to find a way to get the range from the highest score to the lowest score.