What is the right pair of material?

How many days are there between March 24 1947 and April 9 2010? Which is heavier 8 marbles that are exactly alike except that one of them is slightly heavier than the others I then give you a balance scale and ask you to determine the heavier marble in 3 weighings? Can you Solve 3x plus 6 equals x - 10? What does 150 millimeters equal in centimeters? What 432 divided by 21? What geometric figure is a quadrilateral has four equal sides an both pairs of opposite sides are parallel? How is one-degree angle helpful in classifying angles? Is the word mathematics a noun word? What is the average allowance of a 12 year old based on a survey conducted by kids money website? What does q2 mean in the equation? What are different types of measurement systems? Is the number 514482441 how is the relationship between the first pair of 3s the same as the relationship between the second pair of s? Which ancient civilization first used negative numbers? What is 175 over 1000 in its simplest form? 488mm equals how many inches? Is 76 a perfect square or not? What is the factor of the polynomial in descending order x2 plus 7x plus 10? Is a piece of paper a 2D shape or a 3D shape? How many hours is 354 miles? Did Leibniz have siblings?