Directions: For questions with four answer choices, solve each problem and choose the best answer from the choices given. Unless otherwise indicated: all variables and expressions represent real numbers; figures are drawn to scale; the domain of a function is the set of all real numbers for which the function is defined as a real number. Select an answer choice to instantly check your work and read the full step-by-step explanation — this module is built for self-study, so take your time with each problem before moving on.

Reference: Circle: A = πr². Sphere: V = (4/3)πr³. Cone/Pyramid: V = (1/3)(base)(height). Cylinder: V = πr²h. Rectangular solid: V = lwh. Sum of angles in a triangle = 180°. The number of degrees of arc in a circle is 360; the number of radians of arc in a circle is 2π.