State whether the events are independent or dependent. tossing a coin and rolling a number cube

Me. drysdale earned 906.25 in interest in one year on money that he had deposited in his local bank if the bank paid an interest rate of 6.25% how much money did mr. drysdale deposit

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Find the domain of the following expression: 1/(√x)-2