There are four $20 bills, six $10 bills, seven $5 bills, and three $1 bills in your wallet. You select one bill at random. What is the expected value for this experiment?
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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

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much