Janet paid $6.00 for a candle that was marked down for $15.00. what was the percent of decrease

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

Ana earns 2.5% simple interest on $2,000 in her savings account. she does not make any deposits or withdrawals. after 3 years, how much interest will ana have earned on her savings account?

Which number produces an irrational number multiplied by 1/3