Ahiker descended 320 feet in 40 minutes. find the hiker's average change in elevation per minute. show work

hello.

the answer here is 8.

to find this, simply divide the two numbers.

320/40 = 8.

hope this helped

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.