Because they’re both the opposites of eachothers quantities
        
                    
             
        
        
        
9514 1404 393
Answer:
   -3 1/2
Step-by-step explanation:
Put the argument where the variable is and do the arithmetic.
   f(-1/4) = 2(-1/4) -3 = -1/2 -3 
   f(-1/4) = -(3 1/2)
 
        
             
        
        
        
Answer:
 0.078125.
Step-by-step explanation:
This is a geometric sequence with first term a1 = 20 and common ratio r = 10/20 = 5/10 =  0.5.
nth term = a1 r^(n -1) so here:
9th term = 20(0.5)^(9-1)
= 20(0.5)^8
= 0.078125.
 
        
             
        
        
        
I believe its $6.95 but i did that in my head so i might be wrong
        
                    
             
        
        
        
Answer:
There are 3 green marbles in the box.
Step-by-step explanation:
15% = 0.15
To figure out how much 15% of 21 is, you must multipl the decimal form of the percentage by the whole number. This will give you how much of that number that percentage is.
0.15 * 21 = 3.15   
But you can't have 0.15 of a marble, so you must round as well. 
3 green marbles in the box.