The circular region bounded above by y=sqrt 9-x^2 and below by y=-sqrt 9-x^2 is the base of a solid whose cross sections perpendicular to the x-axis are equilateral triangles. The volume of the solid is

Barbara deposited $300 in the bank. if the bank pays her simple interest at the rate of 4 percent per year, how much money will she have in her account at the end of 9 months?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)