Laura is mailing 10 letters and 10 postcards. letters cost 39 cents each and postcards cost 24 cents each. which expression below could be used to find the total cost for this mailing? a. (10)(0.24)(0.39) b. (10)(0.24)+0.39 c. (10)(0.24+0.39) d. 20(0.39+0.24)

i can answer this question sweetie!

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.