How much of a radioactive kind of astatine will be left after 4 seconds if the half-life is 2 seconds and you start with 88 grams?

What is another way to express 36 +32

Atotal of 766 tickets were sold for the school play. they were either adult tickets or student tickets. there were 66 more student tickets sold than adult tickets. how many adult tickets were sold?

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?