Lets do this step by step.
1st.) what is 15% as a decimal 
15% = 0.15 
2nd.) multiply 
220 x 0.15 = 33
3rd) we add that 33 and 220 since this its asking for the increase
220 + 33 = 253
Answer = 253 
        
             
        
        
        
Set f(b) = b^2 - 75 = to 0 and solve for b:
b^2 = 75
b^2 = 25(3)
b = plus or minus sqrt(25[3]) = plus or minus sqrt(25)*sqrt(3) = plus or minus 5 sqrt(3).
        
             
        
        
        
Add 5x + 5 and that is the bottom of it and the top stays 1
        
             
        
        
        
Answer:
Option 3 (C)
Step-by-step explanation:
It is the only one that changes the same amount every time ( times 2 )