An object is located 5.0 cm from a concave mirror. the focal length is 15.0 cm. what is the image distance? use the equation attached. a.3.8 cm b.-3.8 cm c.-7.5 cm d.7.5 cm

(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.)