8.  You can graph this or use the summation function on the TI computer.  
        
                    
             
        
        
        
The value of <em>x </em>in the equation, (3x + 30), is 10.
 
        
                    
             
        
        
        
Answer: 31500 to 38500
Step-by-step explanation:
Lets find lower limit of guess
35000 - ( 35000 * 10% )
= 31500
Upper limit of guess
35000 + ( 35000 * 10% )
= 38500
So your guess can be anything between these two values.
 
        
             
        
        
        
Answer:
5280*13 = 16640 
Step-by-step explanation:
5280*13 = 
5280 
*    13 
-----------
   52800
+  15840
-------------
 16640 
 
        
                    
             
        
        
        
Answer:
y=245 * 1.035^t   $487.50
Step-by-step explanation:
y=245*1.035^20
y=245*1.9898
y=487.49827