What is valitility?

What is the weight of a 2 x 4? What doese it mean when you have to classify the angles greater then 90 or less then 90? What three numbers mulitply into 576? 168 is what percent of 100? How do you calculate kwp? What numbers an go into 1000 evenly? What does a retail manager do? Is 8 oz equal to ¼ of a pound? What are shapes with perpendicular diagonals? How much does tap water cost per gallon? What century is the year 21BC? Which improper fraction is equivalent to the mixed number four and five sevenths? How do you factor 0 equals b2 - 14b plus 96? How many ways can you dress if you only have 2 pair of pants 2 pair of shoes and 2 t-shirts? What percent is one eleventh? What does solution of an equation mean in math? What is 27 percent of 39? What is a real word problem that involves classifying a quadrilateral? Why environmentalist promote zero waste approach? How can a student become good in grade three math?