40 dekameters equal to

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.

When you answer this can you explain

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi