The following are examples of different types of variables. which are discrete variables? Check all that apply A.) Time spent on a telephone call
B.) Number of games played in a football session
C.) Number of pizzas sold in a night
D.) weight of a turkey
E.) Speed of a race car

idk

step-by-step explanation:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.