Answer:
3
Step-by-step explanation:
We know x = -2, so we can substitute -2 in for x
3x^2- 9
3*-2^2-9 
Solve the exponent first (PEMDAS) 
3*4-9 
Multiply next 
12-9
Subtract 
3
 
        
                    
             
        
        
        
Answer:
above is the answer to the question, second picture for clear view
 
        
             
        
        
        
Answer:
You need to rent  14  videos, and you'll pay the same amount for both. Renting 15 will make the membership a better method of payment.
Step-by-step explanation:
Let Number of videos to be rented be x;
Given:
For non members;
Cost of renting 1 video = $4
Cost for renting x videos = 
For Members;
Membership cost = $21
Cost of renting 1 video =  $2.50
Cost of renting x video =  
We can create an equation. Say the number of videos you rent is given by x
. We can write that, if we rent  x  videos without membership, we'll have to pay  . If we rent the same amount of videos with membership, we'll have to pay
. If we rent the same amount of videos with membership, we'll have to pay  .
.
Hence the equation can written as

Hence You need to rent  14  videos, and you'll pay the same amount for both. Renting 15 will make the membership a better method of payment.
 
        
             
        
        
        
The answer is 92 estimates 90