Grades You Believe That There Is a 20% Chance That

Grades You believe that there is a 20% chance that you will earn an A in your English
class, a 10% chance that you will earn an A in your Physics class, and a 5% chance that you
will earn an A in both classes.
a. Find the probability that you do not get an A in either English or Physics.
b. Are "earning an A in English" and "earning an A in Physics" disjoint events? Explain.
c. Are "earning an A in English" and "earning an A in Physics" independent events?
Explain.