I found this online, hope it helps
Just follow these steps:
Multiply normally, ignoring the decimal points.
Then put the decimal point in the answer - it will have as many decimal places as the two original numbers combined.
        
             
        
        
        
Step-by-step explanation:
(o, -2) is the correct answer because in -90° 
P [x,y] =P' [y,-x ]
hope it is helpful to you
 
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
                    
             
        
        
        
None of those choices is correct, because a bare naked fraction without units is not a satisfactory answer.  Keeping the units makes this question easy to answer, and the answer needs units.
The question is asking for a unit rate.  That always means DIVIDE.
                    (18 pizzas) / (12 families)
                 = ( 18/12 )      (pizza/family)  =  1.5 pizza/family .