Answer:
the balloon is filled with the 8.5 litre of helium. temperature is 294 kelvin. 
 party starts at 4 p.m. 
the temperature rises 305 kelvin. 
 the new volume = 4 litres 
 
        
             
        
        
        
On the surface of the earth, an object with a mass of 100 kg will weigh approximately 980 Newtons.
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A soil acidity affects plant growth
        
             
        
        
        
so you can see all the different categories at once. both as a whole and on an individual scale.
 
        
             
        
        
        
The car's speed is 240km/4hr= 60km/hr.
There's not enough information given in the question to determine its velocity.