What is 9d equals 81?

The more there is, the less you see. What am I? How do you put the digits 1 through 9 each used exactly once in the circles so that the total of the numbers in each rectangle is the same? What two numbers multiplied by each other equal 12? Where did the superstions with the number 13 come from? Is there a thousand dollar mansion? What is 48 divided by 22? How do you declare a constant using PHP? What does the m-v-a represent on the Cobra trapshooter ultra model RD-3170? How do you make 101010 into 950 using one line? If the diameter is 203 and the height is 25 what is the volume of the tank to the nearest cubic foot? How many kl in 4500 l? How do you reduce 15 over 85? How many weeks in 18 years? Why is it impossible for an equilateral triangle to be scalene? What if they are both negative? What is 11 times 108? What is the common denominator of 27 and 99? What is thicker 5 mm or 1.8 mm? Dod measure up sec plus? A 75 foot tree trunk is cut into three pieces The longest piece is three times the smallest piece and the other piece is 5 feet longer than the smaller piece Find the length of each piece?