Which solid has one base that is a rectangle and four lateral surfaces that are triangles?

triangular pyramid
cone
rectangular prism
rectangular pyramid

Solve the system of equations. y= 2x y= x^2 - 15

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 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)