Donkey Kong is rolling cylindrical barrels of different sizes at Mario.

The DIAMETER of the barrel is 16.5.

What is the circumference of the barrel?

If your answer is correct Mario will clear the barrel.

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)