Find p(a or b), if the events are disjointed. p(a) = 9/25 p(b) = 9/25

Step-by-step explanation:

We know that when two events are disjoint then their intersection is empty.

if  A and B are disjoint then

Also, we know that the probability of getting A or B is given by :

john earns $14.00 for two hours of work.

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.