What will affect on the volume and the surface area, if you decrease or increase the base area or the height

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?