The actual mechanical advantage of a machine a. cannot be less than 1 b. decreases as the input distant increases c. increases with greater friction d. is less than the ideal mechanical advantage of the machine

Me i've asked this question 3 time asapright triangle abc and its image, triangle a'b'c' are shown below. algebraically prove that a clockwise and counterclockwise rotation of 180o about the origin for triangle abc are equivalent rotations.