Over a period of 12 hours the temperature dropped 36 degrees fahrenheit. What was the average change in tempature per hour

What is this inequality notation? t is less then or equal to 2

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Find the commission on a $590.00 sale if the commission is 15%.