Danielle washes cars for money.
She can wash 12 cars in 3 hours
She earns 18.00 for each car
She is saving up for a computer that cost 720.00
how many hours does Danielle need to work to get her computer

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.