When a child is born, her grandfather decides to put $100 in an account that earns
interest. He plans to make no other deposits or withdrawals for 18 years. When
the child turns 18 years old, the money in the account will be a birthday gift.
The
grandfather is choosing between two options:

Option 1: grows by 10.5% each year

Option 2: grows by $20 each year

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

just get this app called photo math it should be able to do those