See picture for the set up. You finish. Do the math. 
 
 
        
             
        
        
        
4: 0.99
5: 0.66
6: 0.79
7: 5.2
8: 4.86
9: 4.3
I hope I helped! Also, one thing when you adding decimals or multiplying them, pretend the decimal point isn't even there. Then, once you have your answer, you just add the decimal in the middle. Basically just adding like in first grade! Super easy and I hope I helped!
 
        
             
        
        
        
Answer:
-12x^2+46x-6
Step-by-step explanation:
combine like tens and subtract then from eachother
 
        
             
        
        
        
Answer:
$60
Step-by-step explanation:
This is because 400 times 0.03 is 12 and 12 times 5 is 60