A man starts pumping an 18-in diameter well at a constant rate. In the first 60 days of pumping, the drawdown is 10 feet. What additional drawdown might be expected if the pumping were to be continued for another 60 days at the same rate

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236