Even today candles are useful. During a power outage, a family lit up with 20cm candles. His observations made it possible to assess that, every 30 minutes, this length is equivalent to 4/5 of what it was the previous half hour. What is the length of a candle that has burned for 2 and a half hours? can someone help me find the equation of that problem

Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.

How do i do this activity, is appreciated

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum