Answer:
20
Step-by-step explanation:
25% change to .25
.25 x 80
Just solve 25 x 80 which equals 2000
then move decimal over twice giving you 20.00 or 20
 
        
                    
             
        
        
        
Answer:
68 weeks
Step-by-step explanation:
1 week costs $11.50.
so, how many such weekly each cycles fit into the price of new machines ?
if they wait to long (to many weeks) they spend in total more money than buying a new machine. 
but if they stay still below that max. number of weeks, they have at least the illusion that they are cheaper of with the weekly laundromat investment (but they forget, sooner or later they will need the new machines).
so the break even point is simply
782 / 11.5 = 68 weeks. 
after 68 weeks it has cost them exactly the same amount of money, as if they had bought new machines right away at the beginning.
 
        
             
        
        
        
20 because 70 divide by  = 35
        
             
        
        
        
Just use the definitions and put them in order to explain the problem.m. for instance. why are angles a and b vertical angles? they are adjacent and they are supplementary.