Let x represent the total distance around the track
Jason's distance: (5/7)x
Sara ran (4/5) of Jason's distance, 
so she ran (4/5)*(5/7)x = (4/7)x
Sara ran 4/7 of the total distance
        
             
        
        
        
Answer:
D) Adding a catalyst
Explanation:
Adding a catalyst decreases activation energy and allows the reaction to occur more easily.
 
        
             
        
        
        
Answer:
E and B
Explanation:
the warmer the weather the faster it will decompose, this why is why sometimes bodies last longer frozen, or in cool temperatures. 
that statement takes a out.
An illness shouldn't effect a decomposing body
Weight also shouldn't effect a decomposing body
Being buried can make bodies decompose fast because of all the bugs and other animals that will get down there and decompose it faster
Answer: B,E
 
        
             
        
        
        
Answer:
B. an air-conditioning system.
Explanation:
Refrigeration is defined as a process of cooling a system to lower temperature below the surrounding temperature while the removed heat is rejected at higher temperatures.
Heat pumps use the heat output of the refrigeration process, which may also be designed to be reversible, but are otherwise similar to air conditioning units.
 
        
             
        
        
        
Answer:
look
Explanation:
diffculte ou my good i need help too