10 feet of ribbon costs $4.50. How much would 6 feet of ribbon cost??​

Step-by-step explanation:

First find the unit rate aand the multiply the unit rate with 6

Cost of 10 ft ribbon = $ 4.50

Cost of 1 feet ribbon = 4.50 ÷ 10 = $ 0.45

Cost of 6 feet ribbon= 0.45 * 6  = $ 2.70

sorry, i don't know i just need points, i'm new here. chao

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.