What is valitility?

Is zero is a factor of every positive number? What speed would you have to travel in order to cover 125 miles in 6.25 hours? A flat surface that goes on and on in all directions? What does 010011010111? What priestley had done to introduce mint plant without disturbing experimental set up? How did algebra get started? How would you round 12.72 to nearest dollar? How much water will a nine inch pipe hold per foot? What are the 4 names for a square? What is 11 over 100 in simplest form? What are 6 fractions equivilant to one fifth? What is 34 miles plus 34 miles? What are the factors and prime factors of 530? What is the meaning of over the fence? I am a polygon and i have fewer sides than a quadrangle? Is 10122 divisible by 2? What is the value of 8 in 87145? A vertical line in a Cartesian coordinate plane can be defined by a linear equation of the form y equals m x plus b? What is the value of 4 to the 2nd power? An order is placed for n items each costing p dollars and twice as many items each costing 9 dollars more. Write a simplified expression for the total cost of the order?