Answer: 
Step-by-step explanation:
Given
Cost of white-washing =Rs. 4989.60
Rate =20 per meter square
So, inside area of = 
The surface area of dome= 

The volume of air in the dome 

Answer:
the answer is D because "difference" is a key word for subtraction
Step-by-step explanation:
Answer: 3x-5
Step-by-step explanation:
Five subtracted from three times any number can be represented as 3x-5.