
Use the distributive property and combine like terms.
 
        
                    
             
        
        
        
She underestimated by 60 cents. To get this answer all you need to do is multiply 1 dollar times 12 which is $12 and then multiply $.30 by 12 and that gives you $3.60. Then you add the $12 to the $3.60 and that gives you $15.60 which is 60 cents over the estimation.
        
             
        
        
        
where are the anglessssssssss
 
        
             
        
        
        
My answer is 38 students
 ( 22 students take one or both subjects)