What is the NS-SEC?

What is the common denominator of 3 7 9? What is 6 time 5? How do you prepare 0.5 n hcl? Who is responsible for dirt giving way under a fence when one yard is uphill from the other? How big is 138 x 80 land? What is 4 add 4? What is the equivalent of forty? What 2 numbers can be multiplied to get 21? How do you factor 5x2-20? How do you convert us dollars per kilo to us dollar per pound? How many weeks are in 19 days? What is the volume of a cone that has a height of 14 inches and a radius of 9.9 inches multiplyied by 3.14? What is the meaning of equilateral polygon? What two common multiples of 6 and 8? 3 over 8 minus 3 over 16? What is 6.7 AU in km? How do you make the number 17 with only 1234? What are the ten card digits of the thirty nine clue book? What does the word adjecent mean? What is less than 800?