Answer:
How to calculate interest rate
Step 1: To calculate your interest rate, you need to know the interest formula I/Pt = r to get your rate. ... 
I = Interest amount paid in a specific time period (month, year etc.)
P = Principle amount (the money before interest)
t = Time period involved.
r = Interest rate in decimal.
 
        
             
        
        
        
Answer:
x = 3 or -3
Step-by-step explanation:
So you have the equation x² - 9 = 0
Move the 9 to the other side: x² = 9
Then take the square root of both sides:  = ±
 = ±
x = ± = ±3
 = ±3
x = 3 or -3
 
        
                    
             
        
        
        
The third option is the correcto answer
        
                    
             
        
        
        
Have the unknown amount = x 
so 3x : 9x
 you know how many kids meals were bought is equal to the ratio (3x = 12, so x=4)
you already know how many X's for the adults (9) so just multiply (9x4= 36)
lastly add since you need to find the total meals bought (36+12= 48) 
        
                    
             
        
        
        
Answer:
i did it and i think b should be right