A = bc 1. As a increases and c stays constant, b:
2. As c increases and b stays constant a:
3. As b increases and a stays constant c:
Do they increase or decrease?

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?