Alana has been keeping an eye on an emerald ring she likes. Its original price was $39,220. After being marked down for a clearance sale, it is now $21,571. By what percent has the price of the ring gone down?

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)

The area of each triangle is 7 square units. the surface area of the triangular prism is

Write the point-slope form of an equation of the line through the points (-2, -3) and (-7, 4).