Over a 5-hour period, the temperature dropped a total of
12. If the temperature is now
72", what was the temperature at
the beginning of the 5-hour
period?

12°F

Step-by-step explanation:

Temperature dropped

2°F

every

1

hour

After

6

hours

6

hours

×

2°F drop

1

hour

=

12°F drop

There is a drop in

12°F

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.