Answer:  
Step-by-step explanation:
  The first thing you must remember is the mulplication of signs. You know that:
 
 You can observe that the number inside the parentheses is positive (+) and the sign that is outside the parentheses is negative (-), therefore, when you multiply these signs you get a negative sign (-). Then you get:
 
 Now, you need to add these numbers. And the result obtained is:
 
 
        
             
        
        
        
Answer:I think it would be $9
Step-by-step explanation:
50% of 20 is $10
10% of $10 is $1
Subtract 1 from 10, which gives you $9
 
        
             
        
        
        
Answer:
obtuse cant be a right angle
Step-by-step explanation:
in order to be  obtuse you  have to be more than 90 dagrees
 
        
             
        
        
        
Divide 3/4 by 1/8 and you should get 6 hurdles.